Beginning stages for party executors

Aurora/Backend/Server/Party/PartyServiceImpl.cs

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+using System;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+using Aurora.Backend.Proto;
+using Aurora.Backend.Models;
+
+namespace Aurora.Backend.Server.Party
+{
+    class PartyServiceImpl : PartyService.PartyServiceBase
+    {
+        /// <summary>
+        /// Dictionary of party members. Key -> ClientId
+        /// </summary>
+        private Dictionary<string, PartyMember> _partyMembers;
+
+        public PartyServiceImpl()
+        {
+            _partyMembers = new Dictionary<string, PartyMember>();
+        }
+
+        public Dictionary<string, PartyMember> PartyMembers
+        {
+            get
+            {
+                return _partyMembers;
+            }
+        }
+
+        public override Task<JoinPartyResponse> JoinParty(JoinPartyRequest request, Grpc.Core.ServerCallContext context)
+        {
+            _partyMembers.Add(request.ClientId, new PartyMember()
+            {
+                Username = request.UserName,
+                Id = request.ClientId,
+                IpAddress = request.IpAddress,
+                Port = request.Port,
+            });
+
+            JoinPartyResponse response = new JoinPartyResponse() { Status = PartyJoinedStatusEnum.Connected };
+            return Task.FromResult(response);
+        }
+
+        public override Task<LeavePartyResponse> LeaveParty(LeavePartyRequest request, Grpc.Core.ServerCallContext context)
+        {
+            _partyMembers.Remove(request.ClientId);
+            LeavePartyResponse response = new LeavePartyResponse() { Status = PartyJoinedStatusEnum.Disconnected };
+            return Task.FromResult(response);
+        }
+    }
+}