Add Kavita Sort desktop entry and initial zsh function documentation

KavitaSorter/idea.md

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+Create an zsh function, it should in the current folder 
+
+when there is no subfolder
+    - create an folder named Chapter #1
+    - move all files and only files to the newly created folder
+
+when there is already an folder with naming Pattern Chapter#{number}
+    - increment the {number} in the Foldername by 1 and create an new folder named Chapter #[newnumber}
+    - move all Files and only files to the newly created folder, do not touch files in other folders then the current one
+    
+