Add a README and the worktrees script.

README.md

@@ -0,0 +1,17 @@
+README
+======
+System configurations are stored in a seperate branch for each host or purpose.
+
+List available branches:
+  * git branch -avv
+
+Check out specific branch:
+  * git checkout <branch name>
+
+
+WORKTREES
+=========
+Instead of checking out individual branches into the worktree, it is possible to checkout multiple branches into sub-directories to work on concurrently.
+
+The set up script 'worktrees' in the "master" branch will create the necessary structure and add the worktrees.
+This script should only be run once per clone's "master" worktree.

worktrees

@@ -0,0 +1,9 @@
+#!/bin/bash
+# Set up the structure to use worktrees in this clone.
+
+BRANCHES=("core")
+
+for BRANCH in "${BRANCHES[@]"; do
+  mkdir -p "$BRANCH"
+  git worktree add "./$BRANCH" "origin/$BRANCH"
+done