Add Ballerina language (#3818)

* Add Ballerina language

* Add missing file

* Update color

* Update with required changes

* Update sub-module

samples/Ballerina/var.bal

@@ -0,0 +1,28 @@
+import ballerina.lang.system;
+
+function divideBy10 (int d) (int, int) {
+    return d / 10, d % 10;
+}
+
+function main (string[] args) {
+    //Here the variable type is inferred type from the initial value. This is same as "int k = 5";
+    var k = 5;
+    system:println(10 + k);
+
+    //Here the type of the 'strVar' is 'string'.
+    var strVar = "Hello!";
+    system:println(strVar);
+
+    //Multiple assignment with 'var' allows you to define the variable then and there.
+    //Variable type is inferred from the right-hand side.
+    var q, r = divideBy10(6);
+    system:println("06/10: " + "quotient=" + q + " " +
+                   "remainder=" + r);
+
+    //To ignore a particular return value in a multiple assignment statement, use '_'.
+    var q1, _ = divideBy10(57);
+    system:println("57/10: " + "quotient=" + q1);
+
+    var _, r1 = divideBy10(9);
+    system:println("09/10: " + "remainder=" + r1);
+}