docs(README): list GPG fingerprints of qTox maintainers & packagers

Re: #4045 #3912

README.md

@@ -100,7 +100,40 @@ the mailing list**.
 
 There are [IRC logs] available.
 
+### GPG fingerprints
 
+List of GPG fingerprints used by qTox developers to sign commits, merges, tags,
+and possibly other stuff.
+
+Active qTox maintainers:
+
+```
+1157 616B BD86 0C53 9926  F813 9591 A163 FF9B E04C      – antis81
+3103 9166 FA90 2CA5 0D05  D608 5AF9 F2E2 9107 C727      – Diadlo
+C7A2 552D 0B25 0F98 3827  742C 1332 03A3 AC39 9151      – initramfs
+DA26 2CC9 3C0E 1E52 5AD2  1C85 9677 5D45 4B8E BF44      – sudden6
+2880 C860 D95C 909D 3DA4  5C68 7E08 6DD6 6126 3264      – tux3
+BA78 83E2 2F9D 3594 5BA3  3760 5313 7C30 33F0 9008      – zetok
+```
+
+Past qTox maintainers:
+
+```
+F365 8D0A 04A5 76A4 1072  FC0D 296F 0B76 4741 106C      – agilob
+1D29 8BC7 25B7 BE82 65BA  EAB9 3DB8 E053 15C2 20AA      – Dubslow
+```
+
+Windows updates, managed by `tux3`:
+
+```
+AED3 1134 9C23 A123 E5C4  AA4B 139C A045 3DA2 D773
+```
+
+Linux OBS repositories, managed by `abbat`:
+
+```
+3EB5 027B 3CD8 D7CA AC30  EB6B F2AA 0B1E 5EF8 303B
+```
 
 [#qtox@freenode]: https://webchat.freenode.net/?channels=qtox
 [32 bit installer]: https://build.tox.chat/view/qtox/job/qTox_pkg_windows_x86_stable_release/lastSuccessfulBuild/artifact/setup-qtox.exe