add csharp examples (#10)

02_selection_sort/csharp/01_selection_sort/.gitignore

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+**/bin/*
+**/obj/*

02_selection_sort/csharp/01_selection_sort/.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "${workspaceRoot}/bin/Debug/netcoreapp1.0/csharp.dll",
+            "args": [],
+            "cwd": "${workspaceRoot}",
+            "externalConsole": false,
+            "stopAtEntry": false,
+            "internalConsoleOptions": "openOnSessionStart"
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command.pickProcess}"
+        }
+    ]
+}

02_selection_sort/csharp/01_selection_sort/.vscode/tasks.json

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+{
+    "version": "0.1.0",
+    "command": "dotnet",
+    "isShellCommand": true,
+    "args": [],
+    "tasks": [
+        {
+            "taskName": "build",
+            "args": [
+                "${workspaceRoot}/project.json"
+            ],
+            "isBuildCommand": true,
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

02_selection_sort/csharp/01_selection_sort/Program.cs

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+using System;
+using System.Collections.Generic;
+
+namespace ConsoleApplication
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            var arr = new List<int> { 5, 3, 6, 2, 10 };
+            Console.WriteLine(string.Join(", ", SelectionSort(arr)));
+        }
+
+        private static int[] SelectionSort(List<int> arr)
+        {
+            var newArr = new int[arr.Count];
+            for (int i = 0; i < newArr.Length; i++)
+            {
+                var smallest = FindSmallest(arr);
+                newArr[i] = arr[smallest];
+                arr.RemoveAt(smallest);
+            }
+            return newArr;
+        }
+
+        private static int FindSmallest(List<int> arr)
+        {
+            var smallest = arr[0];
+            var smallestIndex = 0;
+            for (int i = 0; i < arr.Count; i++)
+            {
+                if (arr[i] < smallest)
+                {
+                    smallest = arr[i];
+                    smallestIndex = i;
+                }
+            }
+            return smallestIndex;
+        }
+    }
+}

02_selection_sort/csharp/01_selection_sort/project.json

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+{
+  "version": "1.0.0-*",
+  "buildOptions": {
+    "debugType": "portable",
+    "emitEntryPoint": true
+  },
+  "dependencies": {},
+  "frameworks": {
+    "netcoreapp1.0": {
+      "dependencies": {
+        "Microsoft.NETCore.App": {
+          "type": "platform",
+          "version": "1.0.1"
+        }
+      },
+      "imports": "dnxcore50"
+    }
+  }
+}