docs: Electron integration docs (#1142)

* docs: Electron integration docs
* docs: Add platform tags to Electron integration
* ref: Minor wording changes

Author: kamilogorek

docs/integrations/electron.rst

@@ -0,0 +1,70 @@
+Electron
+========
+
+To use Sentry with your Electron application, you will need to use both Raven.js SDKs, one for Browser and one for Node.js.
+Browser SDK is used to report all errors from Electron's ``renderer process``, while Node.js is used to report ``main process`` errors.
+
+On its own, Raven.js will report any uncaught exceptions triggered from your application. For advanced usage examples of Raven.js, please read :doc:`Raven.js usage <../usage>`.
+
+Installation
+------------
+
+Both packages are available via npm.
+
+.. code-block:: sh
+
+    $ npm install raven raven-js --save
+
+First, let's configure ``main process``, which uses the Node.js SDK:
+
+.. code-block:: javascript
+
+    var Raven = require('raven');
+
+    Raven.config('___PUBLIC_DSN___', {
+      captureUnhandledRejections: true
+    }).install();
+
+And now ``renderer process``, which uses the Browser SDK:
+
+.. code-block:: javascript
+
+    var Raven = require('raven-js');
+    Raven.config('___PUBLIC_DSN___').install();
+
+    window.addEventListener('unhandledrejection', function (event) {
+        Raven.captureException(event.reason);
+    });
+
+This configuration will also take care of unhandled Promise rejections, which can be handled in various ways. By default, Electron uses standard JS API.
+To learn more about handling promises, refer to :doc:`Promises <../usage#promises>` documentation.
+
+Sending environment information
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+It's often a good idea to send platform information along with a caught error.
+Some things that we can easily add, but are not limited to, are:
+
+- Environment type (browser/renderer)
+- Electron version
+- Chrome version
+- Operation System type
+- Operation System release
+
+You can configure both processes in the same way. To do this, require the standard Node.js module `os` and add a `tags` attribute to your `config` call:
+
+.. code-block:: javascript
+
+    var os = require('os');
+    var Raven = require('raven');
+
+    Raven.config('___PUBLIC_DSN___', {
+      captureUnhandledRejections: true,
+      tags: {
+        process: process.type,
+        electron: process.versions.electron,
+        chrome: process.versions.chrome,
+        platform: os.platform(),
+        platform_release: os.release()
+      }
+    }).install();

docs/sentry-doc-config.json

@@ -38,6 +38,15 @@
         "integrations/backbone#configuring-the-client"
       ]
     },
+    "javascript.electron": {
+      "name": "Electron",
+      "type": "framework",
+      "doc_link": "integrations/electron/",
+      "wizard": [
+        "integrations/electron#installation",
+        "integrations/electron#configuring-the-client"
+      ]
+    },
     "javascript.ember": {
       "name": "Ember",
       "type": "framework",