Initial data commit

Task/Function-definition/Dart/function-definition.dart

@@ -0,0 +1,17 @@
+main(){
+    print(multiply(1,2));
+    print(multiply2(1,2));
+    print(multiply3(1,2));
+}
+
+// the following definitions are equivalent
+// arrow syntax without type annotations
+multiply(num1, num2) => num1 * num2;
+
+// arrow syntax with type annotations
+int multiply2(int num1, int num2) => num1 * num2;
+
+// c style with curly braces
+int multiply3(int num1, int num2){
+    return num1 * num2;
+}