Squashed '.pointless-xcompose/' content from commit 4e8cda2

git-subtree-dir: .pointless-xcompose
git-subtree-split: 4e8cda2245b5e068e43b47e06adfc6a109cdbb91
Merge commit 'cd8a7e828b8c3147a3e36e1bdea3529dd578ebd0' as '.pointless-xcompose'
Update README to explain about pointless-xcompose.
add XCompose that includes pointless-xcompose