Initial C# SDK structure and interfaces

.gitignore

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+.vs/
+[Bb]in/
+[Oo]bj/
+*.user
+*.suo

Chtn.CSharp.SDK.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

Core/ChateniumClient.cs

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+using Chtn.CSharpSDK.Interfaces;
+using System.Net.Http;
+using System;
+
+namespace Chtn.CSharpSDK.Core
+{
+    public class ChateniumClient
+    {
+        private readonly IKeyringAPI _keyring;
+        private readonly IDatabaseAPI _database;
+        private readonly HttpClient _httpClient;
+
+        public ChateniumClient(IKeyringAPI keyring, IDatabaseAPI database)
+        {
+            _keyring = keyring ?? throw new ArgumentNullException(nameof(keyring));
+            _database = database ?? throw new ArgumentNullException(nameof(database));
+
+            _httpClient = new HttpClient();
+            _httpClient.BaseAddress = new Uri("https://api.chatenium.hu");
+        }
+        public void initialize()
+        {
+            _keyring.Set("keyring", "anyad");
+        }
+    }
+}

Interfaces/IDatabaseAPI.cs

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+namespace Chtn.CSharpSDK.Interfaces
+{
+    public interface IDatabaseAPI
+    {
+        void Set(string collection, string key, object value);
+        string Get(string collection, string key);
+        void Delete(string collection, string key);
+        void Flush();
+    }
+}

Interfaces/IKeyringAPI.cs

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+namespace Chtn.CSharpSDK.Interfaces
+{
+    public interface IKeyringAPI
+    {
+        void Set(string key, object value);
+        string Get(string key);
+        void Delete(string key);
+        void Flush();
+    }
+}