Create Repeatable Test Environment (#5)

* Add /test README.md

* Add basic Tmux configuration for testing

* Add Makefile for testing

* Add basic vimrc to source for testing

* Comment out vim-tmux-navigator lines from test tmux.conf

* Move Makefile out to project root

* Replace test/README with a contributing guide

* Remove commented lines from /test/.tmux.conf

CONTRIBUTING.md

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+# Contibuting
+
+If you find any issues with this repo that you wish to fix, feel free to fork
+it and submit Pull Request with a fix.
+
+## Testing
+
+This plugin does not currently support any automated testing mechanism. Testing
+is instead accomplished manually, aided by using supplied configuration files.
+
+The easiest way to test changes is to use the Makefile supplied. From a
+terminal **with no tmux session**, run:
+
+```
+make test
+```
+
+This will load a new vim session inside of a new tmux session. Both sessions
+will use the *.tmux.conf* and *.vimrc* from */test* in this repo, instead of
+your user's configuration files.

Makefile

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+.PHONY: test
+
+test:
+	tmux -f test/.tmux.conf new-session "nvim -u test/.vimrc"

test/.tmux.conf

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+# Tmux configuration with only bindings required for better-vim-tmux-resizer
+
+# Smart pane switching with awareness of Vim splits.
+# See: https://github.com/christoomey/vim-tmux-navigator
+is_vim="ps -o state= -o comm= -t '#{pane_tty}' \
+    | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|n?vim?x?)(diff)?$'"
+
+# Tmux-vim-resizer
+bind-key -n 'M-h' if-shell "$is_vim" 'send-keys M-h' 'resize-pane -L 10'
+bind-key -n 'M-j' if-shell "$is_vim" 'send-keys M-j' 'resize-pane -D 5'
+bind-key -n 'M-k' if-shell "$is_vim" 'send-keys M-k' 'resize-pane -U 5'
+bind-key -n 'M-l' if-shell "$is_vim" 'send-keys M-l' 'resize-pane -R 10'
+
+# Tmux-vim-resizer copy-mode
+bind-key -T copy-mode-vi 'M-h' resize-pane -L 10
+bind-key -T copy-mode-vi 'M-j' resize-pane -D 5
+bind-key -T copy-mode-vi 'M-k' resize-pane -U 5
+bind-key -T copy-mode-vi 'M-l' resize-pane -R 10

test/.vimrc

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+source plugin/better_vim_tmux_resizer.vim