Merge pull request #66 from microsoft/user/ashtat/AddQuickStart

Added a quick start doc

Documentation/QuickStart.md

@@ -0,0 +1,52 @@
+# How to add the plugin to Unity projects
+
+## 1. Add the spatializer package reference to manifest.json
+This is the recommended way to add the plugin package to a project. 
+- Open the `manifest.json` file from the project in a text editor
+- Add Microsoft's scoped registry and the package reference  
+    <pre>
+    {
+        "scopedRegistries": [
+        {
+            "name": "Microsoft Spatializer",
+            "url": "https://microsoft.pkgs.visualstudio.com/Analog/_packaging/MixedReality-UPM-Internal/npm/registry/",
+            "scopes": [
+            "com.microsoft.spatialaudio"
+            ]
+        },
+        ...
+        ],
+        "dependencies": {
+            ...
+            "com.microsoft.spatialaudio.spatializer.unity": "2.0.5-prerelease",
+            ...
+        }
+    }
+    </pre>
+
+For an example, see the [sample project manifest.](../samples/MicrosoftSpatializerSample/Packages/manifest.json)
+
+The plugin package can also be downloaded from GitHub releases and imported into the project using `Assets > Import Package > Custom Package` menu.  
+
+## 2. Configure the project to use Microsoft Spatializer
+- Open the project settings using `Edit > Project Settings`
+- In the `Audio` tab, select `Microsoft Spatializer` in the `Spatializer Settings` dropdown. No other changes are necessary.
+
+    ![Project Settings](./Images/ProjectSettings.png)
+
+## 3. Add the Microsoft Spatializer Mixer to the project
+`Microsoft Spatializer Mixer` effect is necessary to process all the spatialized audio objects in a scene.
+- Add an audio mixer to the project
+  - In the `Project` pane, right-click on the `Assets` folder, then `Create > Audio Mixer`
+  - Give the mixer a name, e.g. `Master` 
+  - Open the mixer and right-click, then select `Add effect at bottom > Microsoft Spatializer Mixer`
+
+    ![Microsoft Spatializer Mixer](./Images/SpatializerMixerSetup.png)
+
+## 4. Spatialize audio objects
+- Setup spatialized audio objects as usual, making sure to route the `Output` to the `Master` audio mixer setup above.
+
+    ![Audio Object Settings](./Images/AudioObjectSettings.png)
+
+
+