Added readme, missing configuration for rider

Author: Kevin Hellemun

.idea/.idea.BunqSdkCsharp/.idea/preferred-vcs.xml

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+# bunq c# SDK
+
+## Introduction
+Hi developers!
+
+Welcome to the bunq Java SDK integration tests. Currently we are not
+targeting the 100% test coverage, but rather want to be certain that the most
+common scenarios can run without any errors.
+
+## Scenarios 
+These are the scenarios that are currently being tested:
+* Create installation, session-server and device server
+* Create a new MonetaryAccount
+* Create a tab
+* Update the tab
+* Create attachment and avatar
+* Request money from first MA to second MA
+* Accept the request
+* Make a transaction from first MA to second MA
+* Create connect gr code
+* Make a payment to another sandbox user
+* Send a chat message in a recent payment
+* Delete the current session
+* Order a card with a second line
+
+Besides these scenarios, some code of ApiContext, ApiClient and the JSON module 
+are also tested :thumbs_up:.
+
+## Configuration
+To run the tests you must first setup the test configuration JSON. The example
+of a configuration file is located at [`Tests/BunqSdkCsharpTest/Resources/config.example.json`](./BunqSdkCsharpTest/Resources/config.example.json).
+In order to make use of the configuration file, please copy the example to the
+same directory, fill in your sandbox user data and rename the copy to `config.json`.
+
+## Execution
+To run tests via Rider, ....
+
+Afterwards you can right click on the tests folders and should be able to run
+the tests cases form the IDE.