Update README.md

Author: jaxxreal

README.md

@@ -1,2 +1,12 @@
 # tricky-input
-Created with CodeSandbox
+
+Created with [CodeSandbox](https://codesandbox.io/) & [CRA](https://github.com/facebook/create-react-app)
+
+# Requirements
+
+You need to implement `<Input />` component with following restrictions:
+
+1. You can't use `<input>`, `<textarea>` and `contenteditable` attribute.
+2. You can't add event handlers on elements rendered by the `<Input />` component: `addEventListener`, `onChange`, `onClick` and so on.
+
+A minimal version of `<Input />` should be able to move cursor, add and remove character. Any additions are welomce!