add initial instructions

still a lot to improve here but this should be enough to get you started

README.md

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+# discordthemeldr
+A theme loader for unmodified Discord using a HTTP Proxy.
+
+<h2>How does it work?</h2>
+
+This project uses [mitmproxy](https://github.com/mitmproxy/mitmproxy) to bypass Discord's Content Security Policy
+which blocks loading resources (such as images and stylesheets) from third-party sources from loading.
+It achieves that by modifying Discord's response headers to make that policy more open. It also uses that opportunity
+to inject itself into the Discord client when you start it, loading your themes automatically.
+
+**TLDR:** It makes Discord allow loading 3rd party scripts by modifying its server responses.
+
+<h2>Usage</h2>
+
+This project should support all major platforms that are supported by Discord.
+
+<h3>Setup</h3>
+
+You need to have Python 3.10 and mitmproxy installed on your System. You can install it like this:
+
+Linux: install them using your distro's package manager<br>
+macOS: no idea (look it up)<br>
+Windows: Download them here: [Python](https://www.python.org/downloads/windows/), [mitmproxy](https://mitmproxy.org/)
+**(NOTE: When installing Python, make sure "Add to PATH" is checked!)**
+
+
+- Clone this repo:<br>[Download the latest version](https://github.com/RoootTheFox/discordthemeldr/archive/refs/heads/main.zip)
+and extract it somewhere you can remember<br>
+Alternatively, if you have `git` installed, you can use that by executing `git clone https://github.com/RoootTheFox/discordthemeldr` in a Terminal.
+
+- Open the folder you downloaded (and extracted) this repository to and open a Terminal<br>
+  - On Windows, shift+right click somewhere in the folder and click on "Open PowerShell Window here" (may be named slightly different)
+
+- Install the required modules for the project to work using the Terminal:<br>
+`pip install -r requirements.txt`<br>
+If that command does not output any errors, you are ready to go to the next step
+
+- Start the proxy using the Terminal:<br>
+`mitmdump -s discord-proxy.py`<br>
+
+- Install the proxy certificates:
+  - Linux: `sudo trust anchor ~/.mitmproxy/mitmproxy-ca.pem`
+  - Windows: `certutil -addstore root %USERPROFILE%\.mitmproxy\mitmproxy-ca-cert.cer` (might require starting cmd/powershell as admin)
+  - macOS: good luck figuring that out (if you did please submit a PR documenting it)
+
+- Close Discord using CTRL+Q or ALT+F4 and make sure its fully closed (no Discord processes running)
+
+- Start Discord with proxy-server set to '127.0.0.1:8080'
+- - On Linux this can be done by running `discord --proxy-server="127.0.0.1:8080"
+- - On Windows, you can set your System Proxy to 127.0.0.1 Port 8080 in Settings
+- - On macOS you are on your own, look up how to change the System proxy I guess
+
+- If you did everything correctly, the theme loader should now be enabled. You can load themes using DevTools console using these commands:
+  - `loadTheme("direct link to a theme");` - loads a theme from a specified url (has to be the direct download link
+  - `getThemes();` - gets a list of installed themes
+  - `getEnabledThemes();` - gets a list of currently enabled themes
+  - `disableTheme("Theme Name");` - disables a theme (case sensitive!)