Adding all tracks, I guess

csharp/reverse-string/README.md

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+# Reverse String
+
+Reverse a string
+
+For example:
+input: "cool"
+output: "looc"
+
+
+## Source
+
+Introductory challenge to reverse an input string [https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb](https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

csharp/reverse-string/ReverseString.cs

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+using System;
+
+public static class ReverseString
+{
+    public static string Reverse(string input)
+    {
+        throw new NotImplementedException("You need to implement this function.");
+    }
+}

csharp/reverse-string/ReverseString.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>    
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="Example.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.7.2" />
+    <PackageReference Include="xunit" Version="2.3.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
+  </ItemGroup>
+
+</Project>

csharp/reverse-string/ReverseStringTest.cs

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+// This file was auto-generated based on version 1.1.0 of the canonical data.
+
+using Xunit;
+
+public class ReverseStringTest
+{
+    [Fact]
+    public void An_empty_string()
+    {
+        Assert.Equal("", ReverseString.Reverse(""));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void A_word()
+    {
+        Assert.Equal("tobor", ReverseString.Reverse("robot"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void A_capitalized_word()
+    {
+        Assert.Equal("nemaR", ReverseString.Reverse("Ramen"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void A_sentence_with_punctuation()
+    {
+        Assert.Equal("!yrgnuh m'I", ReverseString.Reverse("I'm hungry!"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void A_palindrome()
+    {
+        Assert.Equal("racecar", ReverseString.Reverse("racecar"));
+    }
+}