Publication of LOOPS book 1 by Stephen Kaisler (#244)

* Fix typos

* Initial commit

Add the book Medley LOOPS: The Basic System.

* List LOOPS books and link the first

List the LOOPS books by Stephen Kaisler and link to the first volume.

* Change verb tens

Change verb tens to highlight that LOOPS was the object extension of Interlisp.

* The object extension -> an object extension

* Delete incorrectly named file

Delete the file to reupload it with correct name.

* Rename file

Upload file with the correct name.

Author: pamoroso

content/en/software/using-medley/_index.md

@@ -80,4 +80,8 @@ These documents were converted from Medley's internal format into PDFs. Watch ou
   - [Medley Interlisp: Interactive Programming Environment (derived from Interlisp-D)](/documentation/20211225-interlisp-book-2.pdf)
   - [Medley Interlisp: Interactive Programming Tools (derived from Interlisp-D)](/documentation/2021-interlisp-book-3.pdf)
 - [Interlisp Reference Manual (1993)](/documentation/IRM.pdf)
+- Medley LOOPS Books (LOOPS, the Lisp Object-Oriented Programming System, was an object extension of Interlisp):
+  - [Volume I: Medley LOOPS: The Basic System](/documentation/2024-loops-book-1.pdf)
+  - Volume II: Medley LOOPS: Tools and Utilities (coming in the late fall of 2024)
+  - Volume III: Medley LOOPS: Rule-based Systems and the Truckin Game (coming in the fall of 2025)