Add GitInfo NuGet package (#268)

In this PR, I added a NuGet package called GitInfo. It can replace
Octobot.RepositoryUrl and display the bot version as the current branch
and commit.

---------

Signed-off-by: mctaylors <cantsendmails@mctaylors.ru>
Signed-off-by: Macintxsh <95250141+mctaylors@users.noreply.github.com>

src/BuildInfo.cs

@@ -0,0 +1,52 @@
+namespace Octobot;
+
+public static class BuildInfo
+{
+    public static string RepositoryUrl
+    {
+        get
+        {
+            return ThisAssembly.Git.RepositoryUrl;
+        }
+    }
+
+    public static string IssuesUrl
+    {
+        get
+        {
+            return $"{RepositoryUrl}/issues";
+        }
+    }
+
+    private static string Commit
+    {
+        get
+        {
+            return ThisAssembly.Git.Commit;
+        }
+    }
+
+    private static string Branch
+    {
+        get
+        {
+            return ThisAssembly.Git.Branch;
+        }
+    }
+
+    private static bool IsDirty
+    {
+        get
+        {
+            return ThisAssembly.Git.IsDirty;
+        }
+    }
+
+    public static string Version
+    {
+        get
+        {
+            return IsDirty ? $"{Branch}-{Commit}-dirty" : $"{Branch}-{Commit}";
+        }
+    }
+}