added Kotlin classes section.

Changes done to meta_info.json.
added Kotlin folder

web/thesauruses/kotlin/1.5/classes.json

@@ -0,0 +1,112 @@
+{
+    "meta": {
+      "language": "kotlin",
+      "language_version": "1.5",
+      "language_name": "Kotlin",
+      "structure": "classes"
+    },
+    "concepts": {
+      "normal_class": {
+        "code": "class ClassName {\n // Class body containing properties and methods \n}",
+        "name": "Normal class"
+      },
+      "abstract_class": {
+        "code": "abstract class ClassName {\n // Class body containing abstract methods \n}",
+        "name": "Abstract class"
+      },
+      "interface": {
+        "code": "interface InterfaceName {\n // Interface body containing method declarations \n}",
+        "name": "Interface"
+      },
+      "read_only_class": {
+        "code": "class ClassName(val property: Type) {\n // Only getter methods are provided \n}",
+        "name": "Read-only class"
+      },
+      "static_class": {
+        "code": "class ClassName {\n companion object {\n // Static properties and methods \n}\n}",
+        "name": "Static class"
+      },
+      "inner_class": {
+        "code": "class OuterClassName {\n inner class InnerClassName {\n // Inner class body \n}\n}",
+        "name": "Inner class"
+      },
+      "packages": {
+        "code": "package PackageName",
+        "comment": "Packages are declared at the beginning of the file using the package keyword.",
+        "name": "Packages"
+      },
+      "class_with_generic_type": {
+        "code": "class ClassName<T> {\n var property: T\n}",
+        "comment": "Kotlin generic classes are defined with a type parameter in angle brackets.",
+        "name": "Class with a generic type"
+      },
+      "private_variables": {
+        "code": "private var variableName: Type = value",
+        "name": "Defining private variables"
+      },
+      "protected_variables": {
+        "code": "protected var variableName: Type = value",
+        "name": "Defining protected variables"
+      },
+      "public_variables": {
+        "code": "var variableName: Type = value",
+        "comment": "Variables are public by default in Kotlin.",
+        "name": "Defining public variables"
+      },
+      "static_variables": {
+        "code": "class ClassName {\n companion object {\n var staticVar: Type = value\n}\n}",
+        "name": "Defining static variables"
+      },
+      "private_functions": {
+        "code": "private fun methodName() {\n // Method body \n}",
+        "name": "Defining private functions"
+      },
+      "protected_functions": {
+        "code": "protected fun methodName() {\n // Method body \n}",
+        "name": "Defining protected functions"
+      },
+      "public_functions": {
+        "code": "fun methodName() {\n // Method body \n}",
+        "name": "Defining public functions"
+      },
+      "static_functions": {
+        "code": "class ClassName {\n companion object {\n fun methodName() {\n // Method body \n}\n}\n}",
+        "name": "Defining static functions"
+      },
+      "extends_class": {
+        "code": "class ChildClassName : ParentClassName() {\n // Class body \n}",
+        "name": "Class that inherits/extends another class"
+      },
+      "extending_interface": {
+        "code": "class ClassName : InterfaceName {\n // Class body \n}",
+        "name": "Class/Interface that inherits/extends another class/interface"
+      },
+      "calling_superclass_functions": {
+        "code": "super.methodName()",
+        "name": "Calling a superclass function"
+      },
+      "overriding_superclass_functions": {
+        "code": "override fun methodName() {\n // Overridden method body \n}",
+        "name": "Overriding a superclass function"
+      },
+      "instantiating_object": {
+        "code": "val obj = ClassName()",
+        "name": "Instantiating a new object"
+      },
+      "instantiating_polymorphic_object": {
+        "code": "val obj: InterfaceName = ClassName()",
+        "comment": "An object can be instantiated as a polymorphic type.",
+        "name": "Instantiating a polymorphic object"
+      },
+      "implement_constructor": {
+        "code": "class ClassName(val property: Type) {\n init {\n // Constructor body \n}\n}",
+        "name": "Implementing a class constructor"
+      },
+      "implement_deconstructor": {
+        "not-implemented": true,
+        "comment": "Kotlin does not have destructors like C++.",
+        "name": "Implementing a class deconstructor"
+      }
+    }
+  }
+

web/thesauruses/meta_info.json

@@ -10,6 +10,7 @@
     "haskell": "Haskell",
     "java": "Java",
     "javascript": "JavaScript",
+    "kotlin": "Kotlin",
     "lua": "Lua",
     "nim": "Nim",
     "objectivec": "Objective-C",