Created the commands add.md

docs/commands/add.md

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+# Adding a global channel
+
+## Usage
+
+```bash
+/add
+```
+
+## Description
+
+This command adds a global channel to the current server. A global channel is a channel that is available on all servers
+that have the bot installed. This command can only be used by server administrators.
+
+## Permissions
+
+This command requires the `Administrator` permission.