added docs for 'alias' command

docs/commands/alias.md

@@ -0,0 +1,53 @@
+# alias
+
+Create short-hand commands for longer or frequently used commands.
+
+!!! note
+    Yantra Launcher saves all aliases in memory and is retained even after restarting the Launcher session, unlike the _aliases_ in Unix terminals.
+
+!!! note
+    Pre-defined commands can not be aliased.
+
+## Syntax
+To set an alias:
+```
+alias alias_name = alias_cmd
+```
+
+To get value of an alias:
+```
+alias alias_name
+```
+
+To list all aliases:
+```
+alias
+```
+
+To reset all aliases to default:
+```
+alias -1
+```
+
+## Examples
+
+=== "Example I"
+    ``` title="Simple command alias"
+    alias h = help
+    ```
+    This will create an alias `h` for the `help` command.
+
+=== "Example II"
+    ``` title="Alias with arguments"
+    alias ps = search -playstore
+    ```
+    This will create an alias `ps` for the `search -playstore` command. This will let you search the Play Store with the `ps` command.
+    ```
+    ps Yantra Launcher
+    ```
+
+=== "Example III"
+    ``` title="Alias for app launch"
+    alias cod = launch call of duty
+    ```
+    This will create an alias `cod` for the `launch call of duty` command. This will let you launch Call of Duty with the `cod` command.