docs: add deprecation noticeHEADmaster

Amp-Thread-ID: https://ampcode.com/threads/T-019cc858-2bdd-716d-8668-e1fb47137cf3
Co-authored-by: Amp <amp@ampcode.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/README.txt b/README.txt
index 1ac5cbf..9b59fbd 100755
--- a/README.txt
+++ b/README.txt
@@ -1,3 +1,7 @@
+DEPRECATED
+    This project is no longer maintained. No further updates, bug fixes, or
+    feature additions will be made. Use at your own risk.
+
 dyndns updater
 ==============