Add Building A React App In The Browser as a react til

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_653 TILs and counting..._
+_654 TILs and counting..._
 
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@@ -447,6 +447,7 @@ _653 TILs and counting..._
 - [A Component Is Just A Bag Of Data](react/a-component-is-just-a-bag-of-data.md)
 - [Accessing Env Vars In create-react-app](react/accessing-env-vars-in-create-react-app.md)
 - [Alter The Display Name Of A Component](react/alter-the-display-name-of-a-component.md)
+- [Building A React App In The Browser](react/building-a-react-app-in-the-browser.md)
 - [create-react-app Comes With Lodash](react/create-react-app-comes-with-lodash.md)
 - [Defining State In A Simple Class Component](react/defining-state-in-a-simple-class-component.md)
 - [Destructure Variables As Props To A Component](react/destructure-variables-as-props-to-a-component.md)

react/building-a-react-app-in-the-browser.md

@@ -0,0 +1,21 @@
+# Building A React App In The Browser
+
+There are a couple relatively new tools that give you just about everything
+you need to build a React app in the browser.
+
+The first is [CodeSandbox](https://codesandbox.io/). It has a couple
+pre-configured environments for different technologies. The main one is
+React. CodeSandbox describes itself as such:
+
+> an online editor that helps you create web applications, from prototype to
+> deployment.
+
+The second, which just released out of beta, is
+[Glitch](https://glitch.com/) which comes with projects like
+[react-starter](https://glitch.com/~starter-react) so that you can jump into
+a React project that is ready to roll. Glitch describes itself as:
+
+> the friendly community where you'll build the app of your dreams
+
+You can quickly build and publish React apps in either of these and share
+them with the world.