add Simple File Manager

use a tag instead of commit hash

metadata/com.simplemobiletools.filemanager.txt

@@ -0,0 +1,27 @@
+Categories:System
+License:Apache2
+Web Site:
+Source Code:https://github.com/SimpleMobileTools/Simple-File-Manager
+Issue Tracker:https://github.com/SimpleMobileTools/Simple-File-Manager/issues
+Changelog:https://github.com/SimpleMobileTools/Simple-File-Manager/blob/HEAD/CHANGELOG.md
+
+Auto Name:Simple File Manager
+Summary:A simple file manager for browsing and editing files and directories
+Description:
+A simple and clean file manager for browsing or editing your files and
+directories. Contains no ads, unnecessary permissions and advanced functions.
+What it provides, however, is a dark theme!
+.
+
+Repo Type:git
+Repo:https://github.com/SimpleMobileTools/Simple-File-Manager
+
+Build:1.0,1
+    commit=1.0
+    subdir=app
+    gradle=yes
+
+Auto Update Mode:Version %v
+Update Check Mode:Tags
+Current Version:1.0
+Current Version Code:1