git-alias: add page (#5979)

pages/common/git-alias.md

@@ -0,0 +1,17 @@
+# git alias
+
+> Create shortcuts for Git commands.
+> Part of `git-extras`.
+> More information: <https://github.com/tj/git-extras/blob/master/Commands.md#git-alias>.
+
+- List all aliases:
+
+`git alias`
+
+- Create a new alias:
+
+`git alias "{{name}}" "{{command}}"`
+
+- Search for an existing alias:
+
+`git alias ^{{name}}`