Add developer guide

docs/index.md

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+---
+title: Message Verification and Signing
+description: Bitcoin Message Verification and Signing.
+---
+# Message Verification and Signing
+
+## Description
+
+Bitcore implementation of [bitcoin message signing and verification]
+(http://bitcoin.stackexchange.com/questions/3337/what-are-the-safety-guidelines-for-using-the-sign-message-feature/3339#3339).
+This is used to cryptographically prove that a certain message was signed by the holder of an address private key.
+
+For more information refer to the [bitcore-message](https://github.com/bitpay/bitcore-message) github repo.
+
+## Installation
+
+Message Verification and Signing is implemented as a separate module and you must add it to your dependencies:
+
+For node projects:
+```bash
+npm install bitcore-message --save
+```
+
+For client-side projects:
+```bash
+bower install bitcore-message --save
+```
+
+## Example
+
+To sign a message:
+
+```javascript
+var privateKey = PrivateKey.fromWIF('cPBn5A4ikZvBTQ8D7NnvHZYCAxzDZ5Z2TSGW2LkyPiLxqYaJPBW4');
+var signature = Message('hello, world').sign(privateKey);
+```
+
+To verify a message:
+
+```javascript
+var address = 'n1ZCYg9YXtB5XCZazLxSmPDa8iwJRZHhGx';
+var signature = 'H/DIn8uA1scAuKLlCx+/9LnAcJtwQQ0PmcPrJUq90aboLv3fH5fFvY+vmbfOSFEtGarznYli6ShPr9RXwY9UrIY=';
+var verified = Message('hello, world').verify(address, signature);
+```