Update README.md

Author: MichaelCurrin

cheatsheets/javascript/deno/README.md

@@ -5,3 +5,16 @@ Deno is a JavaScript runtime which is a replacement to Node.js and with a few en
 - https://deno.land/
     > A secure runtime for JavaScript and TypeScript.
 
+
+## Why Deno?
+
+Are you tired of choosing and managing separate dependencies which do all these tasks?
+
+- lint JS (eslint)
+- format JS (prettier)
+- bundle JS (Webpack or Bundler)
+- transpile to older JS (Babel)
+- transpile TS to JS (TypeScript)
+- run tests (Jasmine or Jest)
+
+Then consider using Deno. It is a modern alternative to NodeJS by the same author and it provides all the functionality just mentioned above - without extra depenedencies.