add simple flow

docs/README_simple_flow.md

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+
+# ocean-lib
+
+`ocean-lib-js` is a Javascript/Typescript library to privately & securely publish, exchange, and consume data. With it, you can:
+* **Publish** data services: static data, streaming data, or compute-to-data. Every data service gets its own [ERC20](https://github.com/ethereum/EIPs/blob/7f4f0377730f5fc266824084188cc17cf246932e/EIPS/eip-20.md) token.
+* **Mint** data tokens for a given data service
+* **Transfer** data tokens to another owner
+* **Consume** data tokens, to access the service
+
+`ocean-lib-js` is part of the [Ocean Protocol](www.oceanprotocol.com) toolset.
+
+# Installation
+```
+// ES6
+import { Ocean, Logger } from '@oceanprotocol/lib'
+
+// ES2015
+const { Ocean, Logger } = require('@oceanprotocol/lib')
+
+```
+
+# Quickstart
+
+This section describes a flow with the simplest transfer of value, for static data.
+
+Here's the steps.
+1. Alice publishes a dataset (= publishes a datatoken contract)
+1. Alice mints 100 tokens
+1. Alice transfers 1 token to Bob
+1. Bob consumes dataset
+
+Let's go through each of these in detail.
+
+
+## 1. Alice publishes a dataset (= publishes a datatoken contract)
+
+For now, you're Alice:) Let's proceed.
+
+Run `ganache-cli` locally:
+```bash
+ganache-cli
+```
+
+Then proceed in with your code:
+```javascript
+const tokenAmount = 100
+const transferAmount = 1
+const blob = 'http://localhost:8030/api/v1/provider/services'
+
+const alice = await ocean.accounts.list()[0]
+const bob = await ocean.accounts.list()[0]
+// create datatoken class
+const datatoken = new DataTokens(contracts.factoryAddress, factoryABI, datatokensABI, web3)
+// deploy datatoken
+const tokenAddress = await datatoken.create(blob, alice)
+
+```
+
+## 2. Alice hosts the dataset
+
+Clone [provider-py](https://github.com/oceanprotocol/provider-py) and update your local environment variables:
+
+```
+export FLASK_APP=ocean_provider/run.py
+export PROVIDER_ADDRESS=your_provider_address
+export PROVIDER_KEY=your_provider_key
+export CONFIG='{"File": "https://raw.githubusercontent.com/oceanprotocol/barge/master/README.md"}'
+```
+
+## 3. Alice mints 100 tokens
+
+```javascript
+datatoken.mint(tokenAddress, alice, tokenAmount)
+```
+
+## 4. Alice transfers 1 token to Bob
+
+```javascript
+const ts = await datatoken.transfer(tokenAddress, bob, transferAmount, alice)
+const transactionId = ts['transactionHash']
+```
+
+## 5. Bob consumes dataset
+
+Now, you are Bob :)
+
+
+```javascript
+
+const config = new Config()        
+const ocean = await Ocean.getInstance()
+
+await ocean.assets.download(tokenAddress, blob, transactionId, bob)
+```