Add go-gin, add a basic a ping endpoint

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

go-gin/main.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+func main() {
+	r := gin.Default()
+
+	r.GET("/ping", func(c *gin.Context) {
+		c.JSON(http.StatusOK, gin.H{
+			"message": "pong",
+		})
+	})
+
+	r.Run()
+}