Adding missing ReadMe.md file for few samples. (dotnet#1070)

* Adding missing ReadMe.md file for few samples

* Update csharp/branches-quickstart/README.md

Committing the change which removes the locale from the URL links.

Co-Authored-By: Bill Wagner <[email protected]>

* Update csharp/classes-quickstart/README.md

Committing the change which removes the locale from the URL links.

Co-Authored-By: Bill Wagner <[email protected]>

* Update csharp/list-quickstart/README.md

Committing the change which removes the locale from the URL links.

Co-Authored-By: Bill Wagner <[email protected]>

* Update csharp/list-quickstart/README.md

Committing the change which removes the locale from the URL links.

Co-Authored-By: Bill Wagner <[email protected]>

* Update csharp/numbers-quickstart/README.md

Committing the change which removes the locale from the URL links.

Co-Authored-By: Bill Wagner <[email protected]>

csharp/branches-quickstart/README.md

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+C# Branches and Loops Sample
+================
+
+This sample is part of the [Branches and Loops tutorial](https://docs.microsoft.com/dotnet/csharp/tutorials/intro-to-csharp/branches-and-loops-local)
+for learning C# features. Please see that topic for detailed steps on the code
+for this sample.
+
+Key Features
+------------
+
+This sample demonstrates usage of if-else branches to make decisions in the execution path, loops (while, do-while and for) to perform repeatable operations.
+
+Build and Run
+-------------
+
+To build and run the sample, type the following two commands:
+
+`dotnet restore`
+`dotnet run`
+
+`dotnet restore` restores the dependencies for this sample.
+`dotnet run` builds the sample and runs the output assembly.

csharp/classes-quickstart/README.md

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+C# Classes and Objects Sample
+================
+
+This sample is part of the [Classes and Objects tutorial](https://docs.microsoft.com/dotnet/csharp/tutorials/intro-to-csharp/introduction-to-classes)
+for learning C# features. Please see that topic for detailed steps on the code
+for this sample.
+
+Key Features
+------------
+
+This sample demonstrates introduction of object oriented programming with classes and objects in C#, which explains about creation and usage of classes, objects, constructors, properties and methods.
+
+Build and Run
+-------------
+
+To build and run the sample, type the following two commands:
+
+`dotnet restore`
+`dotnet run`
+
+`dotnet restore` restores the dependencies for this sample.
+`dotnet run` builds the sample and runs the output assembly.

csharp/list-quickstart/README.md

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+C# List Collections Sample
+================
+
+This sample is part of the [List Collections tutorial](https://docs.microsoft.com/dotnet/csharp/tutorials/intro-to-csharp/arrays-and-collections)
+for learning C# features. Please see that topic for detailed steps on the code
+for this sample.
+
+Key Features
+------------
+
+This sample demonstrates management of data collections using generic list type which explains about creation of generic [List<T>](https://docs.microsoft.com/dotnet/api/system.collections.generic.list-1) type. It also explains about modification, searching and sorting of list items.
+
+Build and Run
+-------------
+
+To build and run the sample, type the following two commands:
+
+`dotnet restore`
+`dotnet run`
+
+`dotnet restore` restores the dependencies for this sample.
+`dotnet run` builds the sample and runs the output assembly.

csharp/numbers-quickstart/README.md

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+C# Numbers Sample
+================
+
+This sample is created during the [Numbers in C# tutorial](https://docs.microsoft.com/dotnet/csharp/tutorials/intro-to-csharp/numbers-in-csharp-local)
+for learning C# features. Please see that topic for detailed steps on the code
+for this sample.
+
+Key Features
+------------
+
+This sample demonstrates about numbers and math operations on integer, floating point numbers in C# and also explains about precedence of the different mathematical operations.
+
+Build and Run
+-------------
+
+To build and run the sample, type the following two commands:
+
+`dotnet restore`
+`dotnet run`
+
+`dotnet restore` restores the dependencies for this sample.
+`dotnet run` builds the sample and runs the output assembly.