plugin: Add basic loading test

Will work on testing overlay next.

test/test-plugin/src/index.ts

@@ -0,0 +1,23 @@
+import * as pluginapi from "../../../typings/plugin"
+import * as express from "express"
+import * as path from "path";
+
+export function init(config: pluginapi.PluginConfig) {
+  config.logger.debug("test-plugin loaded!")
+}
+
+export function router(): express.Router {
+  const r = express.Router()
+  r.get("/goland/icon.svg", (req, res) => {
+    res.sendFile(path.resolve(__dirname, "../public/icon.svg"))
+  })
+  return r
+}
+
+export function applications(): pluginapi.Application[] {
+  return [{
+    name: "goland",
+    version: "4.0.0",
+    iconPath: "icon.svg",
+  }]
+}