add comments

src/pmng/app_settings.cr

@@ -1,4 +1,6 @@
 def password_file
+  # Return password file path
+
   begin
     file_path = "#{ENV["PMNG_PWD_FILE"]}"
     file_path.to_s
@@ -9,13 +11,15 @@ def password_file
 end
 
 def input_timeout
+  # Return user input timeout
+
   user_input_timeout = 60
 
   begin
     user_input_timeout = "#{ENV["PMNG_TIMEOUT"]}"
     user_input_timeout.to_i
   rescue KeyError
-    user_input_timeout.to_i
+    user_input_timeout.to_i # return default 60s
   end
 end