BAEL-20864 Move Spring Boot Custom Starter Module

spring-boot-modules/spring-boot-custom-starter/greeter-library/README.md

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+# Greeter App
+
+This app takes in the user's name and messages for different times of day as configuration parameters and outptus the greeting messge. For example it will take the name **John** and the message for morning time as **Good Morning** and output the message **Hello John, Good Morning**.
+
+## Usage
+
+Create and populate the class `GreetingConfig`, instantiate a `Greeter` using the `GreetingConfig` and use it get greeting messages:
+
+```java
+GreetingConfig greetingConfig = new GreetingConfig();
+greetingConfig.put(USER_NAME, "World");
+greetingConfig.put(MORNING_MESSAGE, "Good Morning");
+greetingConfig.put(AFTERNOON_MESSAGE, "Good Afternoon");
+greetingConfig.put(EVENING_MESSAGE, "Good Evening");
+greetingConfig.put(NIGHT_MESSAGE, "Good Night");
+
+Greeter greeter = new Greeter(greetingConfig);
+greeter.greet();
+```