Add proposal approval api endpoint

Change-Id: I3ab864af51735ee7c484df9c66d0b3ec2f6acb36
diff --git a/server/api/api.go b/server/api/api.go
index fd78ee4..ae0af36 100644
--- a/server/api/api.go
+++ b/server/api/api.go
@@ -13,10 +13,10 @@
 const HealthCheckPath = "/healthcheck"
 
 type API struct {
-	Logger  *log.Logger
-	Root    *gin.Engine
-	APIRoot *gin.RouterGroup // 'api/v1'
-	Auth    *gin.RouterGroup // 'api/v1/auth'
+	Logger   *log.Logger
+	Root     *gin.Engine
+	APIRoot  *gin.RouterGroup // 'api/v1'
+	Proposal *gin.RouterGroup // 'api/v1/proposal'
 }
 
 // Init initializes api
@@ -29,6 +29,7 @@
 	})
 	apiObj.APIRoot = router.Group(APIURLSuffix)
 	apiObj.initHealthCheck()
+	apiObj.initProposal()
 
 	apiObj.Root.NoRoute(func(c *gin.Context) {
 		c.JSON(http.StatusNotFound, "Page not found")