Add From Ruby Variables To JavaScript Variables as a vim til

vim/from-ruby-variables-to-javascript-variables.md

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+# From Ruby Variables To JavaScript Variables
+
+I sometimes find myself writing so much Ruby that as soon as I am back in
+a JavaScript file, my code starts looking like this:
+
+```javascript
+const my_javascript_var = 123;
+```
+
+It would be easy enough to hit `caw` to the delete the entire word and then
+retype it as camel case. I happen to have the
+[Abolish.vim](https://github.com/tpope/vim-abolish) plugin installed, so
+there is an even quicker way.
+
+If I hit `crc` over the variable, it will be _coerced_ to camel case.
+
+```javascript
+const myJavascriptVar = 123;
+```
+
+If I hit `crs` then it will be _coerced_ back to snake case. Hit `crc` one
+more time and I can get back to writing some JavaScript.
+
+See `:h abolish-coercion` for more details.