Implemented 'symlink' CLI command

Change-Id: I4d22328291fec99a8959624847ed09ee2272df35
diff --git a/setup.cfg b/setup.cfg
index 6bad8ba..5e63e23 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -52,6 +52,7 @@
 
 trsync =
     push = trsync.cmd.cli:PushCmd
+    symlink = trsync.cmd.cli:SymlinkCmd
     remove = trsync.cmd.cli:RemoveCmd
 
 [global]