Update README.md Installation and QuickStart sections

Author: sebastianewak

README.md

@@ -3,20 +3,43 @@
 ## Creatubbles API Client Unity SDK
 Creatubbles API Client Unity SDK is a simple library built to help you communicate with the latest [Creatubbles API](https://stateoftheart.creatubbles.com/api/).
 
-Current SDK version: 0.1  
-Supported Unity versions: 5.4.x and newer  
-Supported platforms: iOS, macOS (and possibly others, not yet confirmed)
+Current SDK version: `0.1`  
+Supported Unity versions: `5.4.x` and newer  
+Supported output platforms: `iOS`, `macOS` (and possibly others, not yet confirmed)
 
-Please note that library is still under development, and the SDK API is subject to change.
+Please note that library is still under development, and the SDK API might change in next versions.
 
 ## Documentation
-SDK API reference can be found in `Docs/reference/html/index.html` under repository main directory.
+SDK API reference (Doxygen generated) is available under `Docs/reference/html/` as `index.html`.
 
 ## Installation
-### TODO
+Copy  `Assets/Scripts/Creatubbles` to you project's `Assets/Scripts` folder.
 
 ## QuickStart
-### TODO
+1. Contact us at <[email protected]> to obtain application ID and secret.
+
+2. Implement [IApiConfiguration](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Creatubbles/Api/IApiConfiguration.cs) including your application ID and secret.
+
+    See [CreatubblesConfiguration](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Demo/CreatubblesConfiguration.cs) for example implementation.
+
+3. SDK project contains a demo scene `CreatubblesDemo`, which can be used to check how the SDK is working.
+
+4. Implement [ISecureStorage](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Creatubbles/Api/Storage/ISecureStorage.cs).
+
+    See [InMemoryStorage](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Creatubbles/Api/Storage/InMemoryStorage.cs) for example implementation.
+
+    [InMemoryStorage](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Creatubbles/Api/Storage/InMemoryStorage.cs) can be used for **development and testing**, however for **production** a persistent and more secure implementation is required.
+
+    There are solutions available on the Unity Asset Store like [SPrefs](https://www.assetstore.unity3d.com/en/#!/content/56051) or [Secured PlayerPrefs](https://www.assetstore.unity3d.com/en/#!/content/32357), that could be considered for use as underlying implementation.
+
+5. Configure [CreatubblesApiClient](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Creatubbles/Api/CreatubblesApiClient) with instances of [IApiConfiguration](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Creatubbles/Api/IApiConfiguration.cs) and [ISecureStorage](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Creatubbles/Api/Storage/ISecureStorage.cs) from previous steps.
+
+6. Use [CreatubblesApiClient](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Creatubbles/Api/CreatubblesApiClient) to create and send requests.
+
+    Examples of using the API client can be found under `Assets/Scripts/Demo`:
+    * [Logging in](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Demo/LogInDemo.cs)
+    * [Getting landing URLs](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Demo/LandingUrlsDemo.cs)
+    * [Creation upload](https://github.com/creatubbles/ctb-api-unity/blob/master/Assets/Scripts/Demo/UploadDemo.cs)
 
 ## Author
 [Creatubbles](https://www.creatubbles.com/)