charm: add page (#10051)

* charm: add page
---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/charm.md

@@ -0,0 +1,32 @@
+# charm
+
+> Set of tools that makes adding a backend to your terminal-based applications, without worrying about user accounts, data storage and encryption.
+> More information: <https://github.com/charmbracelet/charm>.
+
+- Backup your Charm account keys:
+
+`charm backup-keys`
+
+- Backup Charm account keys to a specific location:
+
+`charm backup-keys -o {{path/to/output_file.tar}}`
+
+- Import previously backed up Charm account keys:
+
+`charm import-keys "{{charm-keys-backup.tar}}"`
+
+- Find where your `cloud.charm.sh` folder resides on your machine:
+
+`charm where`
+
+- Start your Charm server:
+
+`charm serve`
+
+- Print linked SSH keys:
+
+`charm keys`
+
+- Print your Charm ID:
+
+`charm id`