Add git-hooks install script. Update README.md

git-hooks/install-hooks.sh

@@ -0,0 +1,9 b''
+#!/usr/bin/env bash
+
+DOTGIT=`git rev-parse --git-dir`
+TOPLEVEL=`git rev-parse --show-toplevel`
+TO=${DOTGIT}/hooks
+FROM=${TOPLEVEL}/git-hooks
+
+ln -s ${FROM}/post-checkout ${TO}/post-checkout
+ln -s ${FROM}/post-merge ${TO}/post-merge

git-hooks/README.md

@@ -6,9 +6,4 b' For now, we just have `post-checkout` and `post-merge`,'
 both of which just update submodules,
 so make sure that you have a fully synced repo whenever you checkout or pull.
 
-To use these hooks, you can symlink or copy them to your `.git/hooks` directory.
-In `.git/hooks`, do:
-
-    ln -s ../../git-hooks/post-checkout post-checkout
-    ln -s ../../git-hooks/post-merge post-merge
-
+To use these hooks, run `./install-hooks.sh`.