Update readme

README.md

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 # Telegram iOS Source Code Compilation Guide
 
+We welcome all developers to use our API and source code to create applications on our platform.
+There are several things we require from **all developers** for the moment.
+
+# Creating your Telegram Application
+
+1. [**Obtain your own api_id**](https://core.telegram.org/api/obtaining_api_id) for your application.
+2. Please **do not** use the name Telegram for your app — or make sure your users understand that it is unofficial.
+3. Kindly **do not** use our standard logo (white paper plane in a blue circle) as your app's logo.
+3. Please study our [**security guidelines**](https://core.telegram.org/mtproto/security_guidelines) and take good care of your users' data and privacy.
+4. Please remember to publish **your** code too in order to comply with the licences.
+
+# Compilation Guide
+
 1. Install Xcode (directly from https://developer.apple.com/download/more or using the App Store).
 2. Clone the project from GitHub: