add day 2

Author: CADBOT

day-2/lesson-5-create-react-app/creact-react-app-exercise-solution/.gitignore

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+# See https://help.github.com/ignore-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

day-2/lesson-5-create-react-app/creact-react-app-exercise-solution/README.md

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+# create-react-app exercise 2
+
+This directory contains a react app bootstraped with create-react-app. It is mostly unaltered. Like
+usual, run npm install to get the dependencies installed
+
+Your goal is to make the tests executed by the following command pass
+```
+npm test
+```
+
+Alter the file src/App.js to make this test pass. To do so, get rid of all the jsx in the render
+method and render the following instead:
+```
+<div>Hello React</div>
+```