project: reorganize the structure of the project.

* remove dotnet-tool.json because the project does not rely on any dotnet tools.
* remove Directory.Build.props because the solution has only one project.
* move src/SourceGit to src. It's not needed to put all sources into a subfolder of src since there's only one project.

src/Commands/QueryRemotes.cs

@@ -0,0 +1,43 @@
+using System.Collections.Generic;
+using System.Text.RegularExpressions;
+
+namespace SourceGit.Commands
+{
+    public partial class QueryRemotes : Command
+    {
+        [GeneratedRegex(@"^([\w\.\-]+)\s*(\S+).*$")]
+        private static partial Regex REG_REMOTE();
+
+        public QueryRemotes(string repo)
+        {
+            WorkingDirectory = repo;
+            Context = repo;
+            Args = "remote -v";
+        }
+
+        public List<Models.Remote> Result()
+        {
+            Exec();
+            return _loaded;
+        }
+
+        protected override void OnReadline(string line)
+        {
+            var match = REG_REMOTE().Match(line);
+            if (!match.Success)
+                return;
+
+            var remote = new Models.Remote()
+            {
+                Name = match.Groups[1].Value,
+                URL = match.Groups[2].Value,
+            };
+
+            if (_loaded.Find(x => x.Name == remote.Name) != null)
+                return;
+            _loaded.Add(remote);
+        }
+
+        private readonly List<Models.Remote> _loaded = new List<Models.Remote>();
+    }
+}