New git helper scripts 'mfadd' and 'mfqp'

- `mfadd` adds and fetches a user’s fork of Marlin
- `mfqp` invokes `git commit -m`, `mfrb`, `git push -f`

buildroot/share/git/mfadd

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+#
+# mfadd
+#
+# Add a remote and fetch it
+#
+
+MFINFO=$(mfinfo) || exit
+
+IFS=' ' read -a INFO <<< "$MFINFO"
+
+REPO=${INFO[2]}
+OLDBRANCH=${INFO[4]}
+
+case "$#" in
+  1 ) USER=$1 ;;
+  * ) echo "Usage: `basename $0` [user]" 1>&2 ; exit 1 ;;
+esac
+
+set -e
+
+echo "Adding and fetching $USER..."
+
+git remote add -f "$USER" "git@github.com:$USER/$REPO.git"