Initial data commit

Task/Classes/Objective-C/classes-1.m

@@ -0,0 +1,11 @@
+// There are no class variables, so static variables are used.
+static int myClassVariable = 0;
+
+@interface MyClass : NSObject
+{
+    int variable; // instance variable
+}
+
+- (int)variable; // Typical accessor - you should use the same name as the variable
+
+@end

Task/Classes/Objective-C/classes-2.m

@@ -0,0 +1,17 @@
+@implementation MyClass
+
+// Was not declared because init is defined in NSObject
+- (instancetype)init
+{
+    if (self = [super init]) {
+        variable = 0; // not strictly necessary as all instance variables are initialized to zero
+    }
+    return self;
+}
+
+- (int)variable
+{
+    return variable;
+}
+
+@end

Task/Classes/Objective-C/classes-3.m

@@ -0,0 +1,5 @@
+// Creating an instance
+MyClass *mc = [[MyClass alloc] init];
+
+// Sending a message
+[mc variable];