git-create-branch: add page (#5982)

pages/common/git-create-branch.md

@@ -0,0 +1,17 @@
+# git create-branch
+
+> Create a Git branch in a repository.
+> Part of `git-extras`.
+> More information: <https://github.com/tj/git-extras/blob/master/Commands.md#git-create-branch>.
+
+- Create a local branch:
+
+`git create-branch {{branch_name}}`
+
+- Create a branch locally and on origin:
+
+`git create-branch --remote {{branch_name}}`
+
+- Create a branch locally and on upstream (through forks):
+
+`git create-branch --remote upstream {{branch_name}}`