gyb: add page (#9021)

pages/common/gyb.md

@@ -0,0 +1,20 @@
+# gyb
+
+> Command line tool for locally backing up Gmail messages using Gmail's API over HTTPS.
+> More information: <https://github.com/GAM-team/got-your-back>.
+
+- Estimate the number and the size of all emails on your Gmail account:
+
+`gyb --email {{email@gmail.com}} --action estimate`
+
+- Backup a Gmail account to a specific directory:
+
+`gyb --email {{email@gmail.com}} --action backup --local-folder {{path/to/directory}}`
+
+- Backup only important or starred emails from a Gmail account to the default local folder:
+
+`gyb --email {{email@gmail.com}} --search "{{is:important OR is:starred}}"`
+
+- Restore from a local folder to a Gmail account:
+
+`gyb --email {{email@gmail.com}} --action restore --local-folder {{path/to/directory}}`