add instructions how to run hive and nimbus in hive

hive_integration/readme.md

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+nimbus-eth1 hive integration
+-----
+
+This is a short manual to help you quickly setup and run
+hive, for more detailed information please read
+[hive documentation](https://github.com/ethereum/hive/blob/master/docs/overview.md)
+
+## Prerequisities
+
+* A linux machine. Trust me, it does not work on Windows/MacOS
+* Or run a linux inside a VM(e.g. virtualbox) on Windows/MacOS
+* docker installed on your linux
+* go compiler installed on your linux
+
+## Building hive
+
+```bash
+git clone https://github.com/ethereum/hive
+cd ./hive
+go build .
+```
+
+## Available simulations
+
+* devp2p/eth, devp2p/discv4
+* ethereum/sync
+* ethereum/consensus
+* ethereum/rpc
+* ethereum/graphql
+
+## How to run hive
+
+First you need to copy the `hive_intgration/nimbus` into `hive/clients` folder.
+Then run this command:
+
+```
+./hive --sim <simulation> --client <client(s) you want to test against>
+```
+
+Example:
+
+```bash
+./hive --sim devp2p/discv4 --client go-ethereum,openethereum,nimbus
+```