doc(wiki): Created "binding.gyp" files out in the wild (markdown)

"binding.gyp"-files-out-in-the-wild.md

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+This page contains links to some examples of existing `binding.gyp` files that other node modules are using. Take a look at them for inspiration.
+
+To add to this page, just add the link to the project's `binding.gyp` file below:
+
+ * [libxmljs](https://github.com/polotek/libxmljs/blob/master/binding.gyp)
+ * [node-buffertools](https://github.com/bnoordhuis/node-buffertools/blob/master/binding.gyp)
+ * [node-time](https://github.com/TooTallNate/node-time/blob/master/binding.gyp)
+ * [node-serialport](https://github.com/voodootikigod/node-serialport/blob/master/binding.gyp)
+ * [node-serialport2](https://github.com/joeferner/node-serialport2/blob/master/binding.gyp)
+ * [node-weak](https://github.com/TooTallNate/node-weak/blob/master/binding.gyp)
+ * [pty.js](https://github.com/chjj/pty.js/blob/master/binding.gyp)
+ * [ref](https://github.com/TooTallNate/ref/blob/master/binding.gyp)