docs: add readme and license

LICENSE

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+MIT License
+
+Copyright (c) 2024 LizardByte
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# build-deps
+
+[![GitHub Workflow Status (FFmpeg)](https://img.shields.io/github/actions/workflow/status/lizardbyte/build-deps/build-ffmpeg.yml.svg?branch=master&label=ffmpeg%20build&logo=github&style=for-the-badge)](https://github.com/LizardByte/build-deps/actions/workflows/build-ffmpeg.yml?query=branch%3Amaster)
+
+This is a common set of pre-compiled dependencies for LizardByte/Sunshine.
+
+- [FFmpeg](https://ffmpeg.org)
+
+## Usage
+
+1. Add this repository as a submodule to your project.
+
+   ```bash
+   git submodule add https://github.com/LizardByte/build-deps.git third-party/build-deps
+   cd third-party/build-deps
+   git submodule update --init --recursive
+   checkout dist
+   ```
+
+## Plans
+
+- [ ] Convert to a cmake project
+- [ ] Add more dependencies
+  - [ ] boost
+  - [ ] cuda (developer toolkit)
+- [ ] build linux dependencies in Docker (to more closely align with target environments)
+
+## License
+
+This repo is licensed under the MIT License, but this does not cover submodules or patches.
+Please see the individual projects for their respective licenses.