message: Add basic examples to readme
diff: * Strong typing for static config properties, with full type information for configuration items
  * Ability to export static configuration as JSON for consumption by non-javascript projects
  +## Examples
  +
  +### Get the number of decimal places in a Bitcoin
  +
  +#### Javascript
  +```js
  +const { coins } = require('@bitgo/statics');
  +
  +const btc = coins.get('btc');
  +console.log(btc.decimalPlaces);
  +```
  +
  +#### Typescript
  +```typescript
  +import { coins } from '@bitgo/statics';
  +
  +const btc = coins.get('btc');
  +console.log(btc.decimalPlaces);
  +```
  +
  +### Get the contract address for the OmiseGo ERC20 Token
  +
  +#### Javascript
  +```js
  +const { coins } = require('@bitgo/statics');
  +
  +const omg = coins.get('omg');
  +console.log(omg.contractAddress);
  +```
  +
  +#### Typescript
  +```typescript
  +import { coins, Erc20Coin } from '@bitgo/statics';
  +
  +const omg = coins.get('omg');
  +if (omg instanceof Erc20Coin) {
  + console.log(omg.contractAddress);
  +}
  +```
  +
  +### List full names of all defined coins
  +
  +#### Javascript
  +```js
  +const { coins } = require('@bitgo/statics');
  +
  +coins.forEach((coin) => {
  + console.log(coin.fullName);
  +});
  +```
  +
  +#### Typescript
  +```typescript
  +import { coins } from '@bitgo/statics';
  +
  +coins.forEach((coin) => {
  + console.log(coin.fullName);
  +});
  +```
  +
  ## Status
  -* Entirely WIP
  -* __Everything__ is subject to change
  -* This library should not be depended on in it's current form.
  +* UTXO and account base types are defined
  +* Documentation is mostly source code comments and README examples
  +* This library can be depended on, but expect some changes going forward
  ## Project Structure
  -* `src/base.ts`: Interfaces and enums used by coin definitions
  -* `src/coins.ts`: Coin definitions
  -* `src/networks.ts`: Network definitions
  -* `src/stringTypes.ts`: Tagged string literal functions and other string-based types
  -* `src/utxo.ts`: Unspent Transaction Output (UTXO) based coin classes and factory method
  +* `src/base.ts`: Interfaces and enums used by coin implementation classes.
  +* `src/coins.ts`: Coin definitions.
  +* `src/networks.ts`: Network interfaces and implementation classes.
  +* `src/utxo.ts`: Unspent Transaction Output (UTXO) based coin classes and factory function.
  +* `src/account.ts`: Account-based coin classes and factory methods. Includes ERC20 factory functions.
  +* `src/errors.ts`: Custom Error classes
  