add readmes. Fix broken links

README.md

@@ -25,21 +25,21 @@ See the [Development Principles](/docs/development-principles.md) doc for more i
 
 [![Architecture of microservices](./docs/img/architecture-diagram.png)](./docs/img/architecture-diagram.png)
 
-Find **Protocol Buffers Descriptions** at the [`./pb` directory](./pb).
+Find **Protocol Buffers Descriptions** at the [`./pb` directory](./pb/README.md).
 
 | Service                                              | Language      | Description                                                                                                                       |
 | ---------------------------------------------------- | ------------- | --------------------------------------------------------------------------------------------------------------------------------- |
-| [frontend](./src/frontend)                           | Go            | Exposes an HTTP server to serve the website. Does not require signup/login and generates session IDs for all users automatically. |
-| [cartservice](./src/cartservice)                     | C#            | Stores the items in the user's shopping cart in Redis and retrieves it.                                                           |
-| [productcatalogservice](./src/productcatalogservice) | Go            | Provides the list of products from a JSON file and ability to search products and get individual products.                        |
-| [currencyservice](./src/currencyservice)             | Node.js       | Converts one money amount to another currency. Uses real values fetched from European Central Bank. It's the highest QPS service. |
-| [paymentservice](./src/paymentservice)               | Node.js       | Charges the given credit card info (mock) with the given amount and returns a transaction ID.                                     |
-| [shippingservice](./src/shippingservice)             | Go            | Gives shipping cost estimates based on the shopping cart. Ships items to the given address (mock)                                 |
-| [emailservice](./src/emailservice)                   | Python        | Sends users an order confirmation email (mock).                                                                                   |
-| [checkoutservice](./src/checkoutservice)             | Go            | Retrieves user cart, prepares order and orchestrates the payment, shipping and the email notification.                            |
-| [recommendationservice](./src/recommendationservice) | Python        | Recommends other products based on what's given in the cart.                                                                      |
-| [adservice](./src/adservice)                         | Java          | Provides text ads based on given context words.                                                                                   |
-| [loadgenerator](./src/loadgenerator)                 | Python/Locust | Continuously sends requests imitating realistic user shopping flows to the frontend.                                              |
+| [frontend](./src/frontend/README.md)                           | Go            | Exposes an HTTP server to serve the website. Does not require signup/login and generates session IDs for all users automatically. |
+| [cartservice](./src/cartservice/README.md)                     | C#            | Stores the items in the user's shopping cart in Redis and retrieves it.                                                           |
+| [productcatalogservice](./src/productcatalogservice/README.md) | Go            | Provides the list of products from a JSON file and ability to search products and get individual products.                        |
+| [currencyservice](./src/currencyservice/README.md)             | Node.js       | Converts one money amount to another currency. Uses real values fetched from European Central Bank. It's the highest QPS service. |
+| [paymentservice](./src/paymentservice/README.md)               | Node.js       | Charges the given credit card info (mock) with the given amount and returns a transaction ID.                                     |
+| [shippingservice](./src/shippingservice/README.md)             | Go            | Gives shipping cost estimates based on the shopping cart. Ships items to the given address (mock)                                 |
+| [emailservice](./src/emailservice/README.md)                   | Python        | Sends users an order confirmation email (mock).                                                                                   |
+| [checkoutservice](./src/checkoutservice/README.md)             | Go            | Retrieves user cart, prepares order and orchestrates the payment, shipping and the email notification.                            |
+| [recommendationservice](./src/recommendationservice/README.md) | Python        | Recommends other products based on what's given in the cart.                                                                      |
+| [adservice](./src/adservice/README.md)                         | Java          | Provides text ads based on given context words.                                                                                   |
+| [loadgenerator](./src/loadgenerator/README.md)                 | Python/Locust | Continuously sends requests imitating realistic user shopping flows to the frontend.                                              |
 
 ## Features
 

pb/README.md

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+# Read Me
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+This is a placeholder

src/cartservice/README.md

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+# Read Me
+
+This is a placeholder

src/currencyservice/README.md

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+# Read Me
+
+This is a placeholder

src/emailservice/README.md

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+# Read Me
+
+This is a placeholder

src/loadgenerator/README.md

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+# Read Me
+
+This is a placeholder

src/otelcollector/README.md

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+# Read Me
+
+This is a placeholder

src/paymentservice/README.md

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+# Read Me
+
+This is a placeholder

src/recommendationservice/README.md

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+# Read Me
+
+This is a placeholder