add .gitconfig & initial zsh setup

git/.gitconfig

@@ -0,0 +1,6 @@
+[user]
+	name = Laurent Le Houerou
+	email = laurent@lehouerou.net
+[credential]
+	helper = cache --timeout=3600
+

zsh/.zshrc

@@ -0,0 +1,8 @@
+ZINIT_HOME="${XDG_DATA_HOME:-${HOME}/.local/share}/zinit/zinit.git"
+
+if [ ! -d "$ZINIT_HOME" ]; then
+   mkdir -p "$(dirname $ZINIT_HOME)"
+   git clone https://github.com/zdharma-continuum/zinit.git "$ZINIT_HOME"
+fi
+
+source "${ZINIT_HOME}/zinit.zsh"