Add test/README.md

test/README.md

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+Test cases for vim-plug
+=======================
+
+### Prerequisite
+
+- [Vader.vim](https://github.com/junegunn/vader.vim)
+
+### Run
+
+```vim
+:Vader*
+```
+
+### TODO
+
+Test cases for the following features are currently missing:
+
+- Output formatting
+- Timeout or interrupt cleaning up git processes
+- User prompt in PlugClean command
+- Automatic dependency resolution using Plugfile
+