Add usage guide

docs/USAGE.md

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+## Satyr Usage
+
+### Administration
+Satyr needs access to port 1935 for RTMP streams, and will serve HTTP on port 8000. The ports can be changed with follow config lines.
+```
+[http]
+port = 8000
+[rtmp]
+port = 1935
+```
+Changing the rtmp port is not recommended.
+
+For HTTPS, run a reverse proxy in front of satyr. An example nginx block is shown below.
+```
+server {
+    port 80;
+    port [::]80;
+    server_name example.tld;
+    return https://$server_name$request_uri 301;
+}
+server {
+    port 443 ssl;
+    port [::]443 ssl;
+    server_name example.tld;
+
+    ssl_trusted_certificate   /etc/letsencrypt/live/example.tld/chain.pem;
+    ssl_certificate               /etc/letsencrypt/live/example.tld/fullchain.pem;
+    ssl_certificate_key        /etc/letsencrypt/live/example.tld/privkey.pem;
+
+    location / {
+        proxy_pass http://127.0.0.1:8000/;
+    }
+}
+```
+
+Users can be added from the command line even if registration is closed. Use the following syntax.
+```bash
+npm run-script user -- --adduser kawen --password imkawen
+npm run-script user -- --rmuser lain
+```
+
+### Users
+
+#### Accounts
+If registration is open, users can register at example.tld/registration, and set some options such as whether to record VODs and a stream title on /profile
+Stream keys can be changed at example.tld/changesk, and passwords at /changepwd
+
+#### Chat
+Chat is based on Socket.IO, and can be accessed through the webclient at /chat.
+Chatting and changing a nickname do not require authentication, but the usernames of streamers are reserved.
+The following commands are available:
+`/nick kawen (password)` Password is only required if kawen is a registered user.
+`/join kawen` Join the chatroom for kawen's stream and leave the previous room.
+`/kick lain` Available only in your own room if you are a streamer. Forcefully disconnect the user.
+
+#### Streaming
+Users should stream to rtmp://example.tld/stream/examplestreamkey
+The stream will be available at rtmp://example.tld/live/kawen and http://example.tld/live/kawen/index.m3u8 or .mpd if you've enabled DASH. (Enabling both HLS and DASH is not recommended for most use cases.)
+
+Most software, such as OBS, will have a separate field for the URL and stream key, in which case the user can enter rtmp://example.tld/stream/ and the stream key in the appropriate field.