Add Ballerina language (#3818)

* Add Ballerina language

* Add missing file

* Update color

* Update with required changes

* Update sub-module

samples/Ballerina/json.bal

@@ -0,0 +1,31 @@
+import ballerina.lang.system;
+
+function main (string[] args) {
+    // JSON string value.
+    json j1 = "Apple";
+    system:println(j1);
+
+    // JSON number value.
+    json j2 = 5.36;
+    system:println(j2);
+
+    // JSON true value.
+    json j3 = true;
+    system:println(j3);
+
+    // JSON false value.
+    json j4 = false;
+    system:println(j4);
+
+    // JSON null value.
+    json j5 = null;
+
+    //JSON Objects.
+    json j6 = {name:"apple", color:"red", price:j2};
+    system:println(j6);
+
+    //JSON Arrays. They are arrays of any JSON value.
+    json j7 = [1, false, null, "foo",
+               {first:"John", last:"Pala"}];
+    system:println(j7);
+}