Added contributing guidelines file , issue #41

CONTRIBUTING_GUIDELINES.md

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+# Contributing Guidelines  
+
+This documentation contains a set of guidelines to help you during the contribution process.
+
+We are happy to welcome all the contributions from anyone willing to improve this project. Thank you for helping out and remember, **no contribution is small.** 
+
+- Participants are expected to follow project guidelines and coding style.
+- Each participant/contributor will be assigned **2 issues (max)** at a time to work on.
+- Participants/contributors have to give an update about their work in every **3 days** while completing issues. If not then the issue will be assigned to other.
+- Participants/contributors have to **comment** on issues they would like to work on, and mentors will assign you. Direct PRs for Open to all issues .
+- Issues will be assigned on a **first-come, first-serve basis**.
+- Participants/contributors can also **open their issues**, but it needs to be verified and labelled by a mentor.
+- Before opening a new issue, please **check** if it is already created or not.
+- Pull requests will be merged after being **reviewed by a mentor**.
+- Create a pull request from a **branch** other than `main` ,that means you have to create a new branch for every pull request.
+- It might take a day to review your pull request. Please have patience and be nice.
+- We all are here to learn. You are allowed to make mistakes. That's how you learn, right!
+
+- **MAKE SURE TO OPEN A DRAFT PR AS SOON AS YOU START WORKING ON AN ISSUE AND KEEP COMMITING TO IT SO THAT WE CAN KNOW THAT YOU ARE WORKING ON THAT PARTICULAR ISSUE**
+
+- Pull Requests review criteria:
+  - Please fill the **PR template** properly while making a PR.
+  - Example of the **PR template**
+  <img src="contributing.png" width="700">
+
+- **For any queries or discussions, please drop a message.**
+