comment on everything

README.md

@@ -29,12 +29,30 @@ source .venv/bin/activate
 
 ### Client
 
+To run the client with a localhost target:
+
 ```shell
 python -m client
 ```
 
+To target an external server, provide its IP address using the `-s` flag:
+
+```shell
+python -m client -s [server IP address]
+```
+
 ### Server
 
 ```shell
 python -m server
-```
+```
+
+### Common Flags
+
+Make sure that these match between your client and server!!
+
+| Short | Long | Description | Default |
+|-------|---|---|---|
+| `-p`  | `--port` | The port for the client / server to communicate on. | `5005` |
+| `-W`  | `--width` | Image width in pixels. | `640` |
+| `-H` | `--height` | Image height in pixels. | `480` |