docs(windows): Adds docs for installing using Angular CLI on Windows.

Document installation for Windows with Angular CLI.

This closes #569 and #525

Author: mukesh51

docs/install-angular-cli-windows10.md

@@ -0,0 +1,81 @@
+# Installing angular-cli on Windows 10
+
+> There had been installation issues of angular-cli on Windows 10 system. Most of the time these errors are related to Python dependecies and node-gyp.
+
+Something as below :
+
+```bash
+[email protected] install C:\Users\User\AppData\Roaming\npm\node_modules\angu
+lar-cli\node_modules\angular2-template-loader\node_modules\codecov\node_modules\
+execSync
+ node install.js
+
+[execsync v1.0.2] Attempting to compile native extensions.
+{ [Error: spawn node-gyp ENOENT]
+  code: 'ENOENT',
+  errno: 'ENOENT',
+  syscall: 'spawn node-gyp',
+  path: 'node-gyp',
+  spawnargs: [ 'rebuild' ] }
+[execSync v1.0.2]
+    Native code compile failed!!
+    Will try to use win32 extension.
+npm WARN deprecated [email protected]: ReDoS vulnerability parsing Set-Cookie h
+ttps://nodesecurity.io/advisories/130
+npm WARN deprecated [email protected]: Please update to minimatch 3.0.2 or higher
+to avoid a RegExp DoS issue
+npm WARN deprecated [email protected]: Please update to minimatch 3.0.2 or higher
+ to avoid a RegExp DoS issue
+
+ [email protected] install C:\Users\User\AppData\Roaming\npm\node_modules\a
+ngular-cli\node_modules\compression-webpack-plugin\node_modules\node-zopfli
+ node-pre-gyp install --fallback-to-build
+.......................
+```
+
+To resolve this issue, make sure you're upgraded to latest version of **NPM** and try installing angular-cli. This seems to have worked on certain scenarios.
+
+If the above doesn't works then the below steps should help. Please ensure all the commands are executed as an **Administrator**.
+
+### Steps:
+
+### 1) Install node-gyp from [here](https://github.com/nodejs/node-gyp)
+
+```ts
+npm install -g node-gyp
+```
+
+### 2) Install Windows build tool from [here](https://github.com/felixrieseberg/windows-build-tools)
+
+```ts
+npm install --global windows-build-tools
+```
+
+*This will also install python
+
+### 3) Install Angular-CLI
+
+npm install -g angular-cli
+
+This should install angular-cli without errors.
+
+#### Post this installation, follow the installation [guide](https://github.com/angular/angularfire2/blob/master/docs/1-install-and-setup.md) to install AngularFire2 and everything should work as expected.
+
+
+### Note:- 
+When you start your app using "ng serve" in the console, you might still see the below errors. Despite these errors, the application should work as expected and should be able to talk to Firebase.
+
+```ts
+
+ERROR in [default] C:\angularFire2Test\node_modules\angularfire2\interfaces.d.ts:12:34
+Cannot find namespace 'firebase'.
+
+ERROR in [default] C:\angularFire2Test\src\typings.d.ts:6:12
+Subsequent variable declarations must have the same type.  Variable 'require' must be of type 'NodeRequire',
+but here has type 'any'.
+
+ERROR in [default] C:\angularFire2Test\src\typings.d.ts:7:12
+Subsequent variable declarations must have the same type.  Variable 'module' must be of type 'NodeModule',
+but here has type 'any'.
+
+```