Merge pull request #4 from Minish144/readme

Readme update

README.md

@@ -1,4 +1,28 @@
-# go-sms-api
+# Golang SMS API
+## Usage
+### Preparations
+Edit `config.yaml`
 
-## Running
-`sudo go run main.go`
+### Installation
+```bash
+$ go build
+```
+
+### Running
+```bash
+$ sudo ./go-sms-api # sudo is required
+```
+
+## Development
+### Dependencies
+```bash
+$ export GO111MODULE=off
+
+$ go get github.com/grpc-ecosystem/grpc-gateway
+
+$ go get github.com/envoyproxy/protoc-gen-validate
+
+$ cd ~/go/src/github.com/grpc-ecosystem/grpc-gateway
+$ mkdir third_party && cd third_party
+$ git clone https://github.com/googleapis/googleapis.git
+```