Add tasks for all the new languages

Task/Classes/Nim/classes.nim

@@ -0,0 +1,27 @@
+type MyClass = object
+  name: int
+
+proc initMyClass(): MyClass =
+  result.name = 2
+
+proc someMethod(m: var MyClass) =
+  m.name = 1
+
+var mc = initMyClass()
+mc.someMethod()
+
+type
+  Gender = enum male, female, other
+
+  MyOtherClass = object
+    name: string
+    gender: Gender
+    age: Natural
+
+proc initMyOtherClass(name; gender = female; age = 50): auto =
+  MyOtherClass(name: name, gender: gender, age: age)
+
+var person1 = initMyOtherClass("Jane")
+echo person1.name, " ", person1.gender, " ", person1.age # Jane female 50
+var person2 = initMyOtherClass("John", male, 23)
+echo person2.name, " ", person2.gender, " ", person2.age # John male 23