Added plugin prototype

- Added proof of concept plugin prototype
- Added wip plugin page

example/plugins/helloworld/main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	_ "embed"
+	"fmt"
+	"net/http"
+	"strconv"
+
+	plugin "example.com/zoraxy/helloworld/zoraxy_plugin"
+)
+
+//go:embed index.html
+var indexHTML string
+
+func helloWorldHandler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprint(w, indexHTML)
+}
+
+func main() {
+	// Serve the plugin intro spect
+	// This will print the plugin intro spect and exit if the -introspect flag is provided
+	runtimeCfg, err := plugin.ServeAndRecvSpec(&plugin.IntroSpect{
+		ID:            "com.example.helloworld",
+		Name:          "Hello World Plugin",
+		Author:        "foobar",
+		AuthorContact: "admin@example.com",
+		Description:   "A simple hello world plugin",
+		URL:           "https://example.com",
+		Type:          plugin.PluginType_Utilities,
+		VersionMajor:  1,
+		VersionMinor:  0,
+		VersionPatch:  0,
+
+		// As this is a utility plugin, we don't need to capture any traffic
+		// but only serve the UI, so we set the UI (relative to the plugin path) to "/"
+		UIPath: "/",
+	})
+
+	if err != nil {
+		//Terminate or enter standalone mode here
+		panic(err)
+	}
+
+	// Serve the hello world page
+	// This will serve the index.html file embedded in the binary
+	http.HandleFunc("/", helloWorldHandler)
+	fmt.Println("Server started at http://localhost:" + strconv.Itoa(runtimeCfg.Port))
+	http.ListenAndServe(":"+strconv.Itoa(runtimeCfg.Port), nil)
+}