Add .vimrc.

Makefile

@@ -6,6 +6,7 @@ install: dotfiles
 	install -m 0644 dot.tcshrc $(prefix)/.tcshrc
 	install -m 0644 dot.bash_profile $(prefix)/.bash_profile
 	install -m 0644 dot.bashrc $(prefix)/.bashrc
+	install -m 0644 dot.vimrc $(prefix)/.vimrc
 	install -m 0644 dot.zshenv $(prefix)/.zshenv
 	mkdir -p $(prefix)/.config/fish
 	install -m 0644 dot.config/fish/config.fish $(prefix)/.config/fish/config.fish
@@ -14,5 +15,6 @@ diff:
 	diff dot.tcshrc $(prefix)/.tcshrc 2>/dev/null
 	diff dot.bash_profile $(prefix)/.bash_profile 2>/dev/null
 	diff dot.bashrc $(prefix)/.bashrc 2>/dev/null
+	diff dot.vimrc $(prefix)/.vimrc 2>/dev/null
 	diff dot.zshenv $(prefix)/.zshenv 2>/dev/null
 	diff dot.config/fish/config.fish $(prefix)/.config/fish/config.fish 2>/dev/null

dot.vimrc

+set mouse=a
+set tabstop=4