Update Docker Compose and Docker commands

This commit simply updates the README to match the working CMD handling in the Dockerfile, allowing users to pass whatever custom flags they would like easily.

README.md

@@ -213,6 +213,7 @@ services:
       - xmrdata:/home/monero/.bitmonero
     ports:
       - 8081:8081
+    command: "./xmrblocks --daemon-url=monerod:18089 --enable-json-api --enable-autorefresh-option --enable-emission-monitor --enable-pusher"
 
   volumes:
     xmrdata:
@@ -302,6 +303,18 @@ alias xmrblocksmainnet='~/onion-monero-blockchain-explorer/build/xmrblocks    --
 alias xmrblockstestnet='~/onion-monero-blockchain-explorer/build/xmrblocks -t --port 8082 --mainnet-url "http://139.162.32.245:8081" --enable-pusher --enable-emission-monitor'
 ```
 
+Example usage when running via Docker:
+
+```bash
+# Run in foreground
+docker run -it -v <path-to-monero-blockckain-on-the-host>:/home/monero/.bitmonero -p 8081:8081  xmrblocks "./xmrblocks --daemon-url=node.sethforprivacy.com:18089 --enable-json-api --enable-autorefresh-option --enable-emission-monitor --enable-pusher"
+
+# Run in background
+docker run -it -d -v <path-to-monero-blockchain-on-the-host>:/home/monero/.bitmonero -p 8081:8081  xmrblocks "./xmrblocks --daemon-url=node.sethforprivacy.com:18089 --enable-json-api --enable-autorefresh-option --enable-emission-monitor --enable-pusher"
+```
+
+Make sure to always start the portion of command line flags with `./xmrblocks` and set any flags you would like after that, as shown above.
+
 ## Enable Monero emission
 
 Obtaining current Monero emission amount is not straight forward. Thus, by default it is