Add vader tests and docker setup

test/Readme.md

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+# Vimwiki Tests
+
+This directory contains a test framework used to automatically test/verify
+Vimwiki functionality. It is based on the following tools:
+
+- [vim-testbed](https://github.com/tweekmonster/vim-testbed)
+- [Vader](https://github.com/junegunn/vader.vim)
+
+## Resources
+
+- [Vim patches](http://ftp.vim.org/pub/vim/patches/)
+- Example test cases:
+    - [vim-easy-align](https://github.com/junegunn/vim-easy-align/tree/master/test)
+    - [vim-plug](https://github.com/junegunn/vim-plug/tree/master/test)
+    - [ale](https://github.com/w0rp/ale/tree/master/test)
+    - [Other projects](https://github.com/junegunn/vader.vim/wiki/Projects-using-Vader)
+
+## Manual Steps
+
+To build the Docker image run `docker build -t vimwiki` from the Vimwiki
+repository root (same location as the Dockerfile).
+
+To start the tests run `docker run -it --rm -v $PWD:/testplugin -v $PWD/test:/home vimwiki vim-v7.4.1099 -u test/vimrc -i NONE '+Vader! test/*'`
+also from the repository root.
+
+    - Substitute `vim-v7.4.1099` for any of the vim versions in the Dockerfile.