Add tasks for all the new languages

Task/Call-a-function/Sidef/call-a-function-1.sidef

@@ -0,0 +1,10 @@
+foo();                       # without arguments
+foo(1, 2);                   # with two arguments
+foo(args...);                # with a variable number of arguments
+foo(name: 'Bar', age: 42);   # with named arguments
+
+var f = foo;                 # store the function foo inside 'f'
+var result = f();            # obtain the return value of a function
+
+var arr = [1,2,3];
+foo(arr);                    # the arguments are passed by object-reference