Removes config.properties to avoid potential API keys leak

.gitignore

@@ -9,4 +9,5 @@ bin/
 gen/
 
 *.class
-.git
+.git
+config.properties

.sdkmanrc

@@ -1,3 +1,3 @@
 # Enable auto-env through the sdkman_auto_env config
 # Add key=value pairs of SDKs to use below
-java=11.0.11.j9-adpt
+java=11.0.13-tem

README.md

@@ -43,7 +43,7 @@ The Gradle build will install the following jars from maven central
 
 ## Usage
 
-1. Update the config file `config.properties` with your [API key](https://docs.adyen.com/user-management/how-to-get-the-api-key), [Client Key](https://docs.adyen.com/user-management/client-side-authentication) - Remember to add `http://localhost:8080` as an origin for client key, and merchant account name like below:
+1. Copy the `config.properties.example` config file to `config.properties` with your [API key](https://docs.adyen.com/user-management/how-to-get-the-api-key), [Client Key](https://docs.adyen.com/user-management/client-side-authentication) - Remember to add `http://localhost:8080` as an origin for client key, and merchant account name like below:
     ```
     merchantAccount = YourTestMerchantAccount
     apiKey = YourAPIKey