Add tasks for all the new languages

Task/Call-an-object-method/Sidef/call-an-object-method.sidef

@@ -0,0 +1,23 @@
+class MyClass {
+    method foo(arg) { say arg }
+}
+
+var arg = 42;
+
+# Call a class method
+MyClass.foo(arg);
+
+# Alternatively, using an expression for the method name
+MyClass.(:foo)(arg);
+
+# Create an instance
+var instance = MyClass();
+
+# Instance method
+instance.foo(arg);
+
+# Alternatively, by using an expression for the method name
+instance.(:foo)(arg);
+
+# Alternatively, by asking for a method
+instance.method(:foo)(arg);