added playground dir to pseudo manually test gpm

playground/.gitignore

@@ -0,0 +1,3 @@
+*
+!.gitignore
+!gpm-test.sh

playground/gpm-test.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env zsh
+
+[[ -d testproj ]] && rm -rf testproj
+mkdir testproj
+pushd testproj
+echo "README 1" > README
+git init .
+git add README
+git commit -m "initial commit"
+gpm init
+gpm new-issue -t "issue-1" -p "A"
+git co gpm
+cp hooks/prepare-commit-msg{.sample,}
+git add hooks
+git commit -m "updated the prepare-commit-msg git hook"
+git co master
+gpm hooks sync
+popd