Add admin/notes/jargon used in emacs-devel

* admin/notes/jargon: New file.
Ref: https://lists.gnu.org/r/emacs-devel/2025-02/msg00950.html

admin/notes/jargon

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+Glossary of Abbreviations, Acronyms, and Jargon
+
+This document provides a list of common abbreviations, acronyms, and
+jargon used in emacs-devel@gnu.org.  This is a non-exhaustive list.
+Feel free to expand as needed.
+
+---
+
+AKA    - Also known as
+ASAP   - As soon as possible
+AFAICT - As far as I can tell
+BTW    - By the way
+DTRT   - Do the right thing
+FYI    - For your information
+FWIW   - For what it's worth
+HTH    - Hope this helps
+ICYMI  - In case you missed it
+IIRC   - If I recall correctly
+IIUC   - If I understand correctly
+IMO    - In my opinion
+IMHO   - In my humble opinion
+IMNSHO - In my not so humble opinion
+IOW    - In other words
+LMK    - Let me know
+LGTM   - Looks good to me
+NBD    - No big deal
+NP     - No problem
+OTOH   - On the other hand
+PFA    - Please find attached
+POV    - Point of view
+TBH    - To be honest
+TL;DR  - Too long; didn't read
+TRT    - The right thing
+TIA    - Thanks in advance
+WIP    - Work in progress
+WFM    - Works for me
+WRT    - With respect to
+YMMV   - Your mileage may vary