Fix Signal doc styling

signal/README.md

@@ -1,18 +1,23 @@
+# Wiretrustee Signal Server
+
 This is a Wiretrustee signal-exchange server and client library to exchange connection information between Wiretrustee Trusted Device and Wiretrustee Hub
 
 The project uses gRPC library and defines service in protobuf file located in:
  ```proto/signal_exchange.proto```
- 
+
  To build the project you have to do the following things.
 
 Install protobuf version 3 (by default v3 is installed on ubuntu 20.04. On previous versions it is proto 2):
- ```
+
+```bash
+#!/bin/bash
 sudo apt install protoc-gen-go
 sudo apt install golang-goprotobuf-dev
- ```
- 
-Generate gRPC code:
- ```
- protoc -I proto/ proto/signalexchange.proto --go_out=plugins=grpc:proto
+```
 
- ```
+Generate gRPC code:
+
+```bash
+#!/bin/bash
+protoc -I proto/ proto/signalexchange.proto --go_out=plugins=grpc:proto
+```