Update readme file for DLT component

### Client example

This code is not necessary to the service, but it could be used to test the service. It contains

a sample gRPC client which connects the service and perform all the CRUD operations. 

# Fabric deployment notes

## General notes

Current Fabric deployment uses Fabric test network with some additional helping scripts on top of it.

This deployment is highly insecure and *shouldn't be used in production* in any case.

To start the network just run the `raft.sh` from `blockchain/scripts` directory. Use `stop.sh`

when you need to stop the network.

## Server start preparations

To run the server it's necessary to copy certificate file

`fabric-samples/test-network/organizations/peerOrganizations/org1.example.com/ca/ca.org1.example.com-cert.pem`

to the config folder (replacing the existing one). Also it's necessary to copy `scripts/connection-org1.json`

file (again, replacing the old one). After copying, it must be edited. First, all `localhost` entrances

should be replaced with `teraflow.nlehd.de`. Second, `channel` section at the end of the file should be removed.

This should be done after every restart of the Fabric network.

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