Add Documentation Lookup With Vim and Alchemist as an elixir til

elixir/documentation-lookup-with-vim-and-alchemist.md

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+# Documentation Lookup With Vim And Alchemist
+
+_Which argument position is the accumulator for `Enum.reduce/3`?_
+
+_How does `group_by` work?_
+
+I find myself fairly frequently jumping from vim to Chrome to do Google
+searches for Elixir standard lib documentation. It gets the job done, but it
+is kinda slow and I'd prefer to avoid the context switch.
+
+With [alchemist.vim](https://github.com/slashmili/alchemist.vim), Elixir
+documentation lookup is at your finger tips. Just move the cursor over the
+module or function you are curious about and hit `K` (from normal mode).
+
+Curious about `Enum.reduce`? Type it out in your current Vim buffer, move
+the cursor over it, and hit `K`.