Add changelog and readme

packages/react-shared/CHANGELOG.md

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+# CHANGELOG
+
+## vX.X.X - _TBD, 2018_

packages/react-shared/README.md

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+## @0xproject/react-shared
+
+Contains React components & frontend types/utils shared between 0x projects.
+
+## Installation
+
+```bash
+yarn add @0xproject/react-shared
+```
+
+## Contributing
+
+We strongly encourage that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.
+
+Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+
+### Install Dependencies
+
+If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:
+
+```bash
+yarn config set workspaces-experimental true
+```
+
+Then install dependencies
+
+```bash
+yarn install
+```
+
+### Build
+
+```bash
+yarn build
+```
+
+### Lint
+
+```bash
+yarn lint
+```
+
+### Run Tests
+
+```bash
+yarn test
+```