Add ignore line and skip line, more name checks

lines starting with ";" are skipped, empty lines are ignored
if the first line is empty (no name set) an error is thrown
check that title is alphanumeric only

Add a config folder for the config files (ignored)

update readme file

Readme.md

@@ -8,9 +8,14 @@ Init screens from config files
 
 ```txt
 <screen session name>
-<window name>#<command>
+<window name>#<command>;<command>;
+#
+;<ignored line>
 ```
 
-`screen session name` is the name you use for gstting the screen session name, see `screen -ls`. Must be Alphanumeric without spaces.
-`window name` is the name for this window
-`command` can be any comamnd sequence separated by `;`. If nothing given default `^C` shell is used
+- `screen session name` is the name you use for gstting the screen session name, see `screen -ls`. Must be Alphanumeric without spaces and cannot be empty
+- `window name` is the name for this window
+- `command` can be any comamnd sequence separated by `;`. If nothing given default `^C` shell is used
+- If there is only a `#` an empty unnamed window is opened
+- if a line starts with `;` it is skipped
+- empty lines are ignored