readme: add more informations

README.md

@@ -1,2 +1,19 @@
 # api-go
-Api in Go with go-gonic and testify
+Api in Go with go-gonic, gorm and testify
+
+## Before Usage
+* Create `.env` and `.env.testing` from `.env.example`
+* Launch `postgresql` and create database `DB_NAME` in `.env` or/and `.env.testing`
+
+## Usage
+* For functional test `go test -v ./test/functional/*.go`
+* For unit test `go test -v ./test/unit/*.go`
+* For launch server `go run main.go`
+
+## Technology
+    - Go
+    - Gin-Gonic
+    - gorm
+    - CORS
+    - Testify
+    - GolintCI-Lint