git-commits-since: add page (#5968)

pages/common/git-commits-since.md

@@ -0,0 +1,21 @@
+# git commits-since
+
+> Display commits since a specific time or date.
+> Part of `git-extras`.
+> More information: <https://github.com/tj/git-extras/blob/master/Commands.md#git-commits-since>.
+
+- Display commits since yesterday:
+
+`git commits-since {{yesterday}}`
+
+- Display commits since last week:
+
+`git commits-since {{last week}}`
+
+- Display commits since last month:
+
+`git commits-since {{last month}}`
+
+- Display commits since yesterday 2pm:
+
+`git commits-since {{yesterday 2pm}}`