add csharp examples (#10)

06_breadth-first_search/csharp/01_breadth_first_search/.gitignore

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

06_breadth-first_search/csharp/01_breadth_first_search/.vscode/launch.json

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

06_breadth-first_search/csharp/01_breadth_first_search/.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"
+        }
+    ]
+}

06_breadth-first_search/csharp/01_breadth_first_search/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace ConsoleApplication
+{
+    public class Program
+    {
+        private static Dictionary<string, string[]> _graph = new Dictionary<string, string[]>();
+
+        public static void Main(string[] args)
+        {
+            _graph.Add("you", new[] { "alice", "bob", "claire" });
+            _graph.Add("bob", new[] { "anuj", "peggy" });
+            _graph.Add("alice", new[] { "peggy" });
+            _graph.Add("claire", new[] { "thom", "jonny" });
+            _graph.Add("anuj", Array.Empty<string>());
+            _graph.Add("peggy", Array.Empty<string>());
+            _graph.Add("thom", Array.Empty<string>());
+            _graph.Add("jonny", Array.Empty<string>());
+            Search("you");
+        }
+
+        private static bool Search(string name)
+        {
+            var searchQueue = new Queue<string>(_graph[name]);
+            var searched = new List<string>();
+            while (searchQueue.Any())
+            {
+                var person = searchQueue.Dequeue();
+                if (!searched.Contains(person))
+                {
+                    if (PersonIsSeller(person))
+                    {
+                        Console.WriteLine($"{person} is a mango seller");
+                        return true;
+                    }
+                    else
+                    {
+                        searchQueue = new Queue<string>(searchQueue.Concat(_graph[person]));
+                        searched.Add(person);
+                    }
+                }
+            }
+            return false;
+        }
+
+        private static bool PersonIsSeller(string name)
+        {
+            return name.EndsWith("m");
+        }
+    }
+}

06_breadth-first_search/csharp/01_breadth_first_search/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"
+    }
+  }
+}