Introduce ethereum-types package

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+## ethereum-types
+
+Typescript types shared across Ethereum-related packages/libraries/tools.
+
+## Installation
+
+```bash
+yarn add -D ethereum-types
+```
+
+## Usage
+
+```javascript
+import { TransactionReceipt, TxData, TxDataPayable } from 'ethereum-types';
+```
+
+## Contributing
+
+We welcome improvements and fixes from the wider community! 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
+
+To build this package and all other monorepo packages that it depends on, run the following from the monorepo root directory:
+
+```bash
+PKG=ethereum-types yarn build
+```
+
+Or continuously rebuild on change:
+
+```bash
+PKG=ethereum-types yarn watch
+```
+
+### Clean
+
+```bash
+yarn clean
+```
+
+### Lint
+
+```bash
+yarn lint
+```