Adding simnet instructions to README

Author: karliatto

README.md

@@ -40,3 +40,75 @@ If you want Prettier to help you by applying changes on save you have to change
 ### LND
 
 We are using the [LND](https://github.com/lightningnetwork/lnd) REST [API](https://app.swaggerhub.com/apis/lnd-rest/rpc-proto/master)
+
+#### Run you LND with btcd simnet
+
+Simnet is a development/test network run locally that allows us to generate blocks at will, so we can avoid the time-consuming process of waiting for blocks to arrive for any on-chain functionality.
+
+In order to work with [`lnd`](https://github.com/lightningnetwork/lnd), the following build dependencies are required:
+
+- **Go:** `lnd` and `btcd` are written in Go. To install, run one of the following commands:
+
+  ```
+  sudo apt-get install golang-1.11-go
+  ```
+
+  And adding the environment variables to your user's .profile::
+
+  ```
+  export PATH=$PATH:/usr/local/go/bin
+  export PATH=$PATH:$(go env GOPATH)/bin
+  export GOPATH=$(go env GOPATH)
+  ```
+
+- [`btcd`](https://github.com/btcsuite/btcd)
+  Run the following commands to obtain btcd, all dependencies, and install it:
+
+  ```bash
+  go get -u github.com/Masterminds/glide
+  git clone https://github.com/btcsuite/btcd $GOPATH/src/github.com/btcsuite/btcd
+  cd $GOPATH/src/github.com/btcsuite/btcd
+  glide install
+  go install . ./cmd/...
+  ```
+
+- [`lnd`](https://github.com/lightningnetwork/lnd)
+  Run the following commands to obtain and install lnd:
+
+  ```
+  go get -d github.com/lightningnetwork/lnd
+  cd $GOPATH/src/github.com/lightningnetwork/lnd
+  make && make install
+  ```
+
+Once you have `lnd` and `btcd` you can continue:
+
+- Running simnet
+
+  ```
+  btcd --simnet --txindex --rpcuser=kek --rpcpass=kek
+  ```
+
+- Generate bloks using btcctl cli
+
+  ```
+  btcctl --simnet --rpcuser=kek --rpcpass=kek generate 400
+  ```
+
+- Run LND
+
+  ```bash
+  lnd --restlisten=localhost:8001 --datadir=~/.lnd/data --logdir=~/.lnd/log --debuglevel=info --bitcoin.simnet --bitcoin.active --bitcoin.node=btcd --btcd.rpcuser=kek --btcd.rpcpass=kek
+  ```
+
+- Test if it works:
+
+  ```bash
+  lncli --macaroonpath=~/.lnd/data/chain/bitcoin/simnet/admin.macaroon getinfo
+  ```
+
+- Use the REST API
+
+  ```bash
+  curl --insecure --header "Grpc-Metadata-macaroon: $(xxd -ps -u -c 1000  ~/.lnd/data/chain/bitcoin/simnet/admin.macaroon)" https://localhost:8001/v1/getinfo
+  ```