Reorganized folders, added pal-adapter io device folder

pat80-computer/software/z80-assembly/os/libs/strings.asm

@@ -0,0 +1,23 @@
+; Strings manipulation library
+; @author Daniele Verducci
+
+; Transforms case to upper
+
+Strings_strToUpper:
+    ; TODO
+    ret
+
+Strings_strToLower:
+    ; TODO
+    ret
+
+; Transforms character in A to uppercase. If is not a character, returns as is
+; @param A character to transform
+; @return A upper char
+Strings_charToUpper:
+    ; TODO
+    ret
+
+Strings_charToLower:
+    ; TODO
+    ret