glab-mr*: add pages (#7635)

pages/common/glab-mr-create.md

@@ -0,0 +1,24 @@
+# glab mr create
+
+> Manage GitLab merge requests from the command-line.
+> More information: <https://glab.readthedocs.io/en/latest/mr/create.html>.
+
+- Interactively create a merge request:
+
+`glab mr create`
+
+- Create a merge request, determining the title and description from the commit messages of the current branch:
+
+`glab mr create --fill`
+
+- Create a draft merge request:
+
+`glab mr create --draft`
+
+- Create a merge request specifying the target branch, title, and description:
+
+`glab mr create --target-branch {{target_branch}} --title "{{title}}" --description "{{description}}"`
+
+- Start opening a merge request in the default web browser:
+
+`glab mr create --web`