Update README.md

Author: akshay-ap

README.md

@@ -1 +1,27 @@
-# blockchain-access-layer-ethereum-plugin
+# blockchain-access-layer-ethereum-plugin
+
+### Running a Local geth Node
+
+A geth node is used to access the Ethereum network. For development purposes, it is advised not to connect to the main
+Ethereum network, but rather to one of the testnets.
+(another, more difficult option would be to run a local private Ethereum network). In order to connect a geth node
+to [Rinkeby](https://www.rinkeby.io) (one of Ethereum testnets), you can follow these steps:
+
+1. [Install geth](https://github.com/ethereum/go-ethereum/wiki/Installing-Geth):
+   this differs depending on your operating system.
+2. Run geth in the fast-sync mode: This option downlaoads the whole blockchain but does not re-execute all transactions.
+   Syncing the whole testnet blockchain (which is done once only) takes about 1-4 hours (depending on the hardware, the
+   speed of the network connection, and the availability of peers). To start a geth node in the fast-sync mode, execute
+   the following command:
+    ```
+    geth --rpcapi personal,db,eth,net,web3 --rpc --rinkeby --cache=2048 --rpcport "8545"
+    --bootnodes=
+    enode://a24ac7c5484ef4ed0c5eb2d36620ba4e4aa13b8c84684e1b4aab0cebea2ae45cb4d375b77eab56516d34bfbd3c1a833fc51296ff084b770b94fb9028c4d25ccf@52.169.42.101:30303,
+    enode://343149e4feefa15d882d9fe4ac7d88f885bd05ebb735e547f12e12080a9fa07c8014ca6fd7f373123488102fe5e34111f8509cf0b7de3f5b44339c9f25e87cb8@52.3.158.184:30303,
+    enode://b6b28890b006743680c52e64e0d16db57f28124885595fa03a562be1d2bf0f3a1da297d56b13da25fb992888fd556d4c1a27b1f39d531bde7de1921c90061cc6@159.89.28.211:30303
+    ``` 
+   If you want your node to be accessible remotely, apart from configuring your firewall, you also need to use the
+   following extra option, when running the node: ```--rpcaddr "0.0.0.0"```
+3. Test connection: you can test your connection to a running geth node using the following command
+   (make sure to install geth on the computer where you run this command):```geth attach http://localhost:8545```
+   please replace _localhost_ with the ip address of the computer running the node.