join network doc (#606)

* join network doc

* include faucet instructions

* add rpc instructions

* edit persistent peers

* update to latest testnet

docs/guides/join_network.md

@@ -0,0 +1,68 @@
+<!--
+order: 5
+-->
+
+
+# Joining Chainsafe's Public Testnet
+
+This document outlines the steps to join the public testnet hosted by [Chainsafe](https://chainsafe.io). 
+
+## Steps:
+1. Install the Ethermint binaries (ethermintd & ethermint cli):
+```
+git clone https://github.com/cosmos/ethermint
+cd ethermint
+make install
+```
+
+2. Create an Ethermint account:
+```
+ethermintcli keys add <keyname>
+```
+
+3. Copy genesis file:
+Follow this [link](https://gist.github.com/araskachoi/43f86f3edff23729b817e8b0bb86295a) and copy it over to the directory ~/.ethermintd/config/genesis.json
+
+4. Add peers:
+Edit the file located in ~/.ethermintd/config/config.toml and edit line 350 (persistent_peers) to the following;
+```
+"[email protected]:26656,[email protected]:26656,[email protected]:26656"
+```
+
+5. Validate genesis and start the Ethermint network:
+```
+ethermintd validate-genesis
+```
+```
+ethermintd start --pruning=nothing --rpc.unsafe --log_level "main:info,state:info,mempool:info" --trace
+```
+(we recommend running the command in the background for convenience)
+
+6. Start the RPC server:
+```
+ethermintcli rest-server --laddr "tcp://localhost:8545" --unlock-key $KEY --chain-id etherminttestnet-1 --trace
+```
+where `$KEY` is the key name that was used in step 2.
+(we recommend running the command in the background for convenience)
+
+7. Request funds from the faucet:
+You will need to know the Ethereum hex address, and it can be found with the following command:
+
+```
+curl -X POST --data '{"jsonrpc":"2.0","method":"eth_accounts","params":[],"id":1}' -H "Content-Type: application/json" http://localhost:8545
+```
+Using the output of the above command, you will then send the command with your valid Ethereum address:
+```
+curl --header "Content-Type: application/json" --request POST --data '{"address":"0xYourEthereumHexAddress"}' 3.95.21.91:3000
+```
+
+## Public Testnet Node RPC Endpoints
+
+Node0: `54.210.246.165:8545`
+Node1: `3.86.104.251:8545`
+Node2: `18.204.206.179:8545`
+
+example:
+```
+curl -X POST --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}' -H "Content-Type: application/json" 54.210.246.165:8545
+```