add sample module

sample/init.js

@@ -0,0 +1,17 @@
+// this is called from the `app.js` function `initModule()` around line `200`
+// from there you can get the structure passed in the "server" object
+// which includes and `api` and other helper functions
+
+module.exports = function(server) {
+
+server.util.log("--- sample server-side module installed ---");
+
+// insert script after all others in kiri browser code
+server.inject("kiri", "kiri.js", {end: true});
+
+server.onload(() => {
+    server.util.log("--- called after all modules loaded ---");
+});
+
+
+};

sample/kiri.js

@@ -0,0 +1,6 @@
+console.log('--- in the browser main loop ---');
+
+// the kiri api starts around line `260` of `src/kiri/main.js`
+kiri.load(function(api) {
+    console.log('--- kiri startup complete ---');
+});

sample/readme.md

@@ -0,0 +1,16 @@
+# Application modules
+
+This allows for the loading of server-side modules which can, in turn,
+inject browser modules into applications like Kiri:Moto.
+
+To enable the sample module:
+
+* create a `mod` directory at the root of grid-apps
+* copy the sample directory into the mod directory: `mod/sample`
+* (re)start `gs-app-server`
+* you will see log lines at start-up similar to this
+
+```
+220128.120432 '[head]' { module: './mod/sample/init.js' }
+220128.120432 '[head]' '--- sample server-side module loaded ---'
+```