doc: add 23.1 release notes

doc/release-notes/release-notes-23.1.md

@@ -0,0 +1,90 @@
+23.1 Release Notes
+==================
+
+Bitcoin Core version 23.1 is now available from:
+
+  <https://bitcoincore.org/bin/bitcoin-core-23.1/>
+
+This release includes new features, various bug fixes and performance
+improvements, as well as updated translations.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://bitcoincore.org/en/list/announcements/join/>
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes in some cases), then run the
+installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on macOS)
+or `bitcoind`/`bitcoin-qt` (on Linux).
+
+Upgrading directly from a version of Bitcoin Core that has reached its EOL is
+possible, but it might take some time if the data directory needs to be migrated. Old
+wallet versions of Bitcoin Core are generally supported.
+
+Compatibility
+==============
+
+Bitcoin Core is supported and extensively tested on operating systems
+using the Linux kernel, macOS 10.15+, and Windows 7 and newer.  Bitcoin
+Core should also work on most other Unix-like systems but is not as
+frequently tested on them.  It is not recommended to use Bitcoin Core on
+unsupported systems.
+
+### P2P
+
+- #25314 p2p: always set nTime for self-advertisements
+
+### RPC and other APIs
+
+- #25220 rpc: fix incorrect warning for address type p2sh-segwit in createmultisig
+- #25237 rpc: Capture UniValue by ref for rpcdoccheck
+- #25983 Prevent data race for pathHandlers
+- #26275 Fix crash on deriveaddresses when index is 2147483647 (2^31-1)
+
+### Build system
+
+- #25201 windeploy: Renewed windows code signing certificate
+- #25788 guix: patch NSIS to remove .reloc sections from installer stubs
+- #25861 guix: use --build={arch}-guix-linux-gnu in cross toolchain
+- #25985 Revert "build: Use Homebrew's sqlite package if it is available"
+
+### GUI
+
+- #24668 build, qt: bump Qt5 version to 5.15.3
+- gui#631 Disallow encryption of watchonly wallets
+- gui#680 Fixes MacOS 13 segfault by preventing certain notifications
+
+### Tests
+
+- #24454 tests: Fix calculation of external input weights
+
+### Miscellaneous
+
+- #26321 Adjust .tx/config for new Transifex CLI
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- Andrew Chow
+- brunoerg
+- Hennadii Stepanov
+- John Moffett
+- MacroFake
+- Martin Zumsande
+- Michael Ford
+- muxator
+- Pavol Rusnak
+- Sebastian Falbesoner
+- W. J. van der Laan
+
+As well as to everyone that helped with translations on
+[Transifex](https://www.transifex.com/bitcoin/bitcoin/).