Add Spring Cloud Stream function based apps

Resolves #135

spring-cloud-stream-function-bindings/time-source/src/main/java/com/example/timesource/TimeSourceApplication.java

@@ -0,0 +1,32 @@
+package com.example.timesource;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.function.Supplier;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@SpringBootApplication
+public class TimeSourceApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(TimeSourceApplication.class, args);
+	}
+
+	@Configuration
+	public class TimeSupplierConfiguration {
+		public TimeSupplierConfiguration() {
+		}
+
+		@Bean
+		public Supplier<String> timeSupplier() {
+			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
+			return () -> {
+				return sdf.format(new Date());
+			};
+		}
+	}
+}