docs on modules

modules/Layout.js

@@ -1,5 +1,8 @@
+/* Copyright (c) 2022 Bangle.js contibutors. See the file LICENSE for copying permission. */
 /*
 
+Take a look at README.md for hints on developing with this library.
+
 Usage:
 
 ```

modules/README.md

@@ -1,9 +1,54 @@
 App Modules
 ===========
 
-These are modules used by apps - you can use them with:
+These are modules used by apps - you can use them from a Bangle.js app with:
 
 ```
 var testmodule = require("testmodule");
 testmodule.test()
 ```
+
+Development
+-----------
+
+When apps that use these modules are uploaded via the
+app loader, the module is automatically included in the app's source. However
+when developing via the IDE the module won't get pulled in by default.
+
+To fix this you have three options:
+
+### Host your own App Loader and upload from that
+
+This is reasonably easy to set up, but it's more difficult to make changes and upload:
+
+* Follow the steps here to set up your own App Loader: https://www.espruino.com/Bangle.js+App+Loader
+* Make changes to that repository
+* Refresh and upload your app from the app loader (you can have the IDE connected
+  at the same time so you can see any error messages)
+
+### Upload the module to the Bangle's internal storage
+
+This allows you to develop both the app and module very quickly, but the app is
+uploaded in a slightly different way to what you'd get when you use the App Loader
+or the method below:
+
+* Load the module's source file in the Web IDE
+* Click the down-arrow below the upload button, then `Storage`
+* Click `New File`, type `your_module_name` as the name (with no `.js` extension), click `Ok`
+* Now Click the `Upload` icon.
+
+You can now upload the app direct from the IDE. You can even leave a second Web IDE window open
+(one for the app, one for the module) to allow you to change the module.
+
+### Change the Web IDE search path to include Bangle.js modules
+
+This is nice and easy (and the results are the same as if the app was
+uploaded via the app loader), however you cannot then make/test changes
+to the module.
+
+* In the IDE, Click the `Settings` icon in the top right
+* Click `Communications` and scroll down to `Module URL`
+* Now change the module URL from the default of `https://www.espruino.com/modules`
+to `https://banglejs.com/apps/modules|https://www.espruino.com/modules`
+
+The next time you upload your app, the module will automatically be included.

modules/dane_arwes.js

@@ -1,6 +1,8 @@
 /* Copyright (c) 2020 OmegaRogue. See the file LICENSE for copying permission. */
 /*
 Graphics Functions based on the React Sci-Fi UI Framework Arwes
+
+Take a look at README.md for hints on developing with this library.
 */
 
 var C = {