add csharp examples (#10)

08_greedy_algorithms/csharp/01_set_covering/.gitignore

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

08_greedy_algorithms/csharp/01_set_covering/.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "${workspaceRoot}/bin/Debug/netcoreapp1.0/01_set_covering.dll",
+            "args": [],
+            "cwd": "${workspaceRoot}",
+            "externalConsole": false,
+            "stopAtEntry": false,
+            "internalConsoleOptions": "openOnSessionStart"
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command.pickProcess}"
+        }
+    ]
+}

08_greedy_algorithms/csharp/01_set_covering/.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"
+        }
+    ]
+}

08_greedy_algorithms/csharp/01_set_covering/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace ConsoleApplication
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            var statesNeeded = new HashSet<string> { "mt", "wa", "or", "id", "nv", "ut", "ca", "az" };
+            var stations = new Dictionary<string, HashSet<string>>();
+            stations.Add("kone", new HashSet<string> { "id", "nv", "ut" });
+            stations.Add("ktwo", new HashSet<string> { "wa", "id", "mt" });
+            stations.Add("kthree", new HashSet<string> { "or", "nv", "ca" });
+            stations.Add("kfour", new HashSet<string> { "nv", "ut" });
+            stations.Add("kfive", new HashSet<string> { "ca", "az" });
+            var finalStations = new HashSet<string>();
+            while (statesNeeded.Any())
+            {
+                string bestStation = null;
+                var statesCovered = new HashSet<string>();
+                foreach (var station in stations)
+                {
+                    var covered = new HashSet<string>(statesNeeded.Intersect(station.Value));
+                    if (covered.Count > statesCovered.Count){
+                        bestStation = station.Key;
+                        statesCovered = covered;
+                    }
+                }
+                statesNeeded.RemoveWhere(s => statesCovered.Contains(s));
+                finalStations.Add(bestStation);
+            }
+            Console.WriteLine(string.Join(", ", finalStations));
+        }
+    }
+}

08_greedy_algorithms/csharp/01_set_covering/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"
+    }
+  }
+}