Add some _examples in the main repository too.

Former-commit-id: 98895c34115ec2076b431332f0ffe9645adf7590

_examples/examples/static-files/assets/css/styles.css

@@ -0,0 +1,3 @@
+body {
+    background-color: black;
+}

_examples/examples/static-files/main.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"gopkg.in/kataras/iris.v6"
+	"gopkg.in/kataras/iris.v6/adaptors/httprouter"
+)
+
+func main() {
+	app := iris.New()
+	app.Adapt(httprouter.New())
+	// first parameter is the request path
+	// second is the operating system directory
+	app.StaticWeb("/static", "./assets")
+
+	app.Listen(":8080")
+}