(wiki): Add windows service documentation

wiki/windows.md

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+# Installing As a Windows Service
+
+Loosely based upon the instructions found [here](http://asysadmin.tumblr.com/post/32941224574/running-nginx-on-windows-as-a-service). I crafted the following and it provided me with a fully working verdaccio service installation:
+
+1. Create a directory for verdaccio
+    * mkdir `c:\verdaccio`
+    * cd `c:\verdaccio`
+2. Install verdaccio locally (I ran into npm issues with global installs)
+    * npm install verdaccio
+3. Create your `config.yaml` file in this location `(c:\verdaccio\config.yaml)`
+4. Windows Service Setup
+
+## Using NSSM
+
+ALTERNATIVE METHOD: (WinSW package was missing when I tried to download it)
+
+* Download [NSSM](https://www.nssm.cc/download/) and extract
+
+* Add the path that contains nssm.exe to the PATH
+
+* Open an administrative command
+
+* Run nssm install verdaccio At a minimum you must fill in the Application tab Path, 
+Startup directory and Arguments fields. Assuming an install with node in the system path and a 
+location of c:\verdaccio the below values will work:
+    * Path: `node`
+    * Startup directory: `c:\verdaccio`
+    * Arguments: `c:\verdaccio\node_modules\verdaccio\lib\cli.js -c c:\verdaccio\config.yaml`
+    
+    You can adjust other service settings under other tabs as desired. When you are done, click Install service button
+    
+ * Start the service sc start verdaccio
+
+## Using WinSW
+
+* As of 2015-10-27, WinSW is no longer available at the below location. Please follow the Using NSSM instructions above.
+* Download [WinSW](http://repo.jenkins-ci.org/releases/com/sun/winsw/winsw/)
+    * Place the executable (e.g. `winsw-1.9-bin.exe`) into this folder (`c:\verdaccio`) and rename it to `verdaccio-winsw.exe`
+* Create a configuration file in `c:\verdaccio`, named `verdaccio-winsw.xml` 
+with the following configuration `xml verdaccio verdaccio verdaccio node c:\verdaccio\node_modules\verdaccio\lib\cli.js -c c:\verdaccio\config.yaml roll c:\verdaccio\ `.
+* Install your service
+    * `cd c:\verdaccio`
+    * `verdaccio-winsw.exe install`
+* Start your service
+    * `verdaccio-winsw.exe start`
+    
+Some of the above config is more verbose than I had expected, it appears as though 'workingdirectory'
+is ignored, but other than that, this works for me and allows my verdaccio instance to 
+persist between restarts of the server, and also restart itself should there be any crashes of the verdaccio process.    
+