Add base readme and documentation

Author: Fabrice Bascoulergue

DOCUMENTATION.md

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+# Javascript SDK Documentation

README.md

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-# sdk-javascript
+# Sandblock Chain - Javascript SDK
+
+This Javascript SDK enables browsers and NodeJS clients to interact with the Sandblock Chain.
+
+## SDK Features
+
+This SDK basically provides an easy access to all the available Sandblock Chain RPCs as well as the payload generation and the cryptographic features to properly consume those RPCs.
+
+**Most comonly used features:**
+
+- Core cryptographic tools and functions
+- Client service:
+    - Connection to a blockchain node (http and socket mode)
+    - Transaction broadcast
+    - Blockchain RPCs
+- Accounts and wallets:
+    - Accounts seed and encrypted mnemonic generation
+    - Unlock accounts from private keys, keystore and mnemonic
+    - Wallet balance
+- Transactions
+    - Payload generation
+    - Signature
+
+## Documentation
+
+The SDK code should be documented enough for developers to explore it and use it easily. Therefore the documentation might not cover all the capabilities of the SDK. Feel free to contribute if you wish to improve the code documentation and/or the provided samples.
+
+The [Documentation](./DOCUMENTATION.md) contains:
+- Installation instructions
+- Basic usage
+- Code samples
+
+## Contributing
+
+Contributions are most welcome.
+
+Please test your changes with a local client and add unit tests coverage for your code before submission.
+
+## Special notes
+
+Thanks to the Binance team for their work on the Binance Javascript SDK which inspired this project structure and development.