Add source and npm tree.

examples/modules/README.md

@@ -0,0 +1,47 @@
+## Napa module source tree
+
+The source codes can be organized as the structure below. This is different from npm package structure since npm
+ doesn’t contain source tree until we figure it out how to compile Napa module from npm install. This example uses
+ msbuild as build system until napa team finds the good one for cross-platform.
+```
++-- napa-module-example
+    +-- inc
+    |   +-- example.h
+    +-- src
+    |   +-- example.cpp
+    |   +-- example.vcxproj
+    +-- node
+    |   +-- addon.h
+    |   +-- addon.cpp
+    |   +-- addon.vcxproj
+    +-- napa
+    |   +-- addon.vcxproj
+    +-- script
+    |   +-- src
+    |   |   +-- example.ts
+    |   +-- package.json
+    |   +-- script.vcxproj
+    |   +-- tsconfig.json
+    +-- test
+    |   +-- example-test.njsproj
+    |   +-- test.ts
+    +-- README.md
+```
+
+## Napa MPM tree
+
+This is the simple NPM package structure, which has module binaries directly. Once Napa team figure out the build system
+ under *npm install*, this will be changed to support cross-platform build and test.
+```
++-- napa-module-example
+    +-- bin
+    |   +-- addon.napa
+    |   +-- addon.node
+    +-- lib
+    |   +-- example.js
+    +-- typings
+    |   +-- example.d.ts
+    +-- package.json
+    +-- tsconfig.json
+    +-- README.md
+```

examples/modules/hello-world/README.md

@@ -32,12 +32,26 @@ NAPA_MODULE(addon, Init)
 * *NAPA_SET_METHOD* is equivalent to *NODE_SET_METHOD*. This module will have *hello()* function.
 * *NAPA_MODULE* is equivalent to *NODE_MODULE*, which exports an initialization function.
 
-## Build
+## Typescript
+It's recommended that typescript or typescript definition is provided to let the user know the APIs without
+ the source codes and develop Typescript project easily.
+### hello-world.ts
+```ts
+var addon = require('../bin/addon');
+
+export function hello(): string {
+    return addon.hello();
+}
+```
+### hello-world.d.ts
+```d.ts
+export declare function hello(): string;
+```
 
 ## Mocha test
 ```js
 var assert = require('assert');
-var helloWorld = require('./hello-world');
+var helloWorld = require('hello-world');
 
 describe('Test suite for hello-word', function() {
     it('prints the string "world"', function() {