docs: add readme

README.md

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+# GameDB
+
+[![GitHub Workflow Status (DB)](https://img.shields.io/github/actions/workflow/status/lizardbyte/gamedb/update-db.yml.svg?branch=master&label=update%20db&logo=github&style=for-the-badge)](https://github.com/LizardByte/GameDB/actions/workflows/update-db.yml?query=branch%3Amaster)
+
+This repository clones IGDB to gh-pages to be consumed by LizardByte projects, such as LizardByte/Sunshine.
+
+Information from YouTube API is also added to the database for videos.
+
+## Plans
+
+- [ ] Build with Jekyll
+  - [ ] Revamp index page
+  - [ ] Provide an item page for each API item
+- [ ] Remove CNAME after next Sunshine release (> v0.23.1)
+- [ ] Move python code to `src` directory
+- [ ] Add unit tests
+- [ ] Add code coverage