git-delta: add page (#6010)

Co-authored-by: CleanMachine1 <78213164+CleanMachine1@users.noreply.github.com>
Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

pages/common/git-delta.md

@@ -0,0 +1,13 @@
+# git delta
+
+> List files that differ from another branch.
+> Part of git-extras.
+> More information: <https://github.com/tj/git-extras/blob/master/Commands.md#git-delta>.
+
+- List files from the current checked out branch that differ from the `main` branch:
+
+`git delta {{main}}`
+
+- List files from specific branch that differ from another specific branch:
+
+`git delta {{branch_1}} {{branch_2}}`