add: README

README.md

@@ -0,0 +1,15 @@
+# README
+
+## Installation
+
+```bash
+git clone --recurse-submodules git@git.cryptic.systems:volker.raschek/vim.git ~/.vim
+```
+
+## Update
+```bash
+cd ~/.vim
+git fetch origin
+git rebase origin/master
+git submodule update --init --recursive
+```