[Update] Change readme

Author: SamuelMuloki

Line23/main.cpp renamed to Hello world/main.cpp

@@ -1,6 +1,6 @@
 //
 //  main.cpp
-//  Line23
+//  Hello world
 //
 //  Created by samuel muloki on 11/05/2019.
 //  Copyright © 2019 line23. All rights reserved.

Line23.xcodeproj/project.pbxproj

@@ -334,7 +334,7 @@
 		3BFCD6C12286F98E008D7CCC = {
 			isa = PBXGroup;
 			children = (
-				3BFCD6CC2286F98E008D7CCC /* Line23 */,
+				3BFCD6CC2286F98E008D7CCC /* Hello world */,
 				3BFCD6DC2287036C008D7CCC /* calc */,
 				3B1FFD192287F9EF00581BF4 /* evenOdd */,
 				3B1FFD242287FE6400581BF4 /* swap */,
@@ -369,12 +369,12 @@
 			name = Products;
 			sourceTree = "<group>";
 		};
-		3BFCD6CC2286F98E008D7CCC /* Line23 */ = {
+		3BFCD6CC2286F98E008D7CCC /* Hello world */ = {
 			isa = PBXGroup;
 			children = (
 				3BFCD6CD2286F98E008D7CCC /* main.cpp */,
 			);
-			path = Line23;
+			path = "Hello world";
 			sourceTree = "<group>";
 		};
 		3BFCD6DC2287036C008D7CCC /* calc */ = {

Line23.xcodeproj/project.xcworkspace/xcuserdata/samuelmuloki.xcuserdatad/UserInterfaceState.xcuserstate

@@ -1 +1,37 @@
-# CPPExamples
+# CPPExamples
+
+This repository consists a variety of c++ examples from C++ How to program by deitel 10ed.
+
+## Hello world
+- This a starter hello world application.
+
+## Calc
+- A simple c++ calculator.
+
+## Classes
+This folder defines a CPP starter for Object oriented programming.
+- It has a header file *Account.h* that has a class *Account*.
+
+## Control flow
+- In this folder you will find a header file *student.h* with a function *getLetterGrade* that uses an if statement and returns a letter grade for each mark.
+
+## CounterControlled
+- In this folder under main you will find an example of a while loop.
+
+## EvenOdd
+- This takes an input from the user and determines if the number input is even or odd.
+
+## Factorial
+- Simple factorial example in c++.
+
+## FileSystem
+- Contains c++ file system operations.
+
+## MathLibraryFunctions
+- Contins c++ Math library functions
+
+## PrimeNumbers
+- Determines if a number input by the user is a prime number
+
+## Swap
+- Swap two numbers an display them after swap