Added documentation for send command (#105)

Send command was not documented, so I wrote some barebones documentation
for it so people know that it exists

Author: rhodso

commands/send.md

@@ -0,0 +1,38 @@
+# send
+
+LinuxGSM comes with a game server `send` command.
+
+## Commands
+
+Standard: `./gameserver send your_command_here`
+
+Send will send a command to the gameserver, as if it were entered into the console of the gameserver.
+
+### Scheduled Commands
+
+A [cronjob](../configuration/cronjobs.md) can be set to run `send` at any given time.
+
+To edit cronjobs,. type:
+
+`crontab -e`
+
+A cronjob can be run as the `gameserver user` or as `root`, this choice is down to personal preference. Remember to amend the examples to match a specific game server.
+
+Here is an example of a user based cronjob to send a message to a server every hour.
+
+```text
+0 * * * * /home/username/gameserver send "Test Message" > /dev/null 2>&1
+```
+
+Here is an example of a root based cronjob to send a message once every hour.
+
+{% hint style="info" %}
+The extra `su - username -c` indicates which user to run the script as.
+{% endhint %}
+
+```text
+0 * * * * su - username -c '/home/username/gameserver send "Test Message"' > /dev/null 2>&1
+```
+
+[crontab.guru](https://crontab.guru/) is a great resource to generate cronjobs.
+