Add the required project.json for the release system

Author: tiennou

updates/.gitignore

@@ -1,2 +1 @@
-project.json
 *.key

updates/project.json

@@ -0,0 +1,8 @@
+{
+    "project_name": "GitX",
+    "base_version": "0.16",
+    "release_branch": "master",
+    "codesign_identity": "Mac Developer: Etienne Samson",
+    "update_signing_key": "gitx-updates.key",
+    "release_tag_format": "builds/$base_version/$build_number"
+}