Add README

README.md

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+# [instances.invidio.us](https://instances.invidio.us)
+
+Status page for list of [Invidious](https://github.com/omarroth/invidious) instances, sourced from [here](https://github.com/omarroth/invidious/wiki/Invidious-Instances).
+
+## Installation
+
+```bash
+$ git clone https://github.com/omarroth/instances.invidio.us
+$ cd instances.invidio.us
+$ shards install
+$ crystal build src/instances.cr --release
+```
+
+## Usage
+
+```bash
+$ ./instances -h
+    -b HOST, --bind HOST             Host to bind (defaults to 0.0.0.0)
+    -p PORT, --port PORT             Port to listen for connections (defaults to 3000)
+    -s, --ssl                        Enables SSL
+    --ssl-key-file FILE              SSL key file
+    --ssl-cert-file FILE             SSL certificate file
+    -h, --help                       Shows this help
+```
+
+## Contributing
+
+1. Fork it (<https://github.com/omarroth/instances.invidio.us/fork>)
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create a new Pull Request
+
+## Contributors
+
+- [Omar Roth](https://github.com/omarroth) - creator and maintainer