feat: add a readme file with an installation guide

README.md

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+# Discord Webhook Integration for YouTrack
+YouTrack currently has no decent way of sending webhook notifications to Discord as of right now, so this project solves just that.
+
+## Installation
+1. Create a new workflow on YouTrack, name it something like `discord-webhook` or whatever.
+2. In the YouTrack workflow scripting area that you're taken to, press the + button on your workflow and add a custom module for each JavaScript file in this project.
+3. Paste and save the contents of each JavaScript file from this project into the custom modules.
+4. Change the config file set up the integration.
+5. Test if the integration works by creating a new issue on YouTrack.