docs: update README and INSTALL guide

Author: kanru

INSTALL

@@ -1,35 +1,31 @@
 Installation Instructions
 *************************
+
 0. Required: 
-    cmake      >= 3.21.0
-    ibus       >= 1.3
-    glib       >= 2
-    gob        >= 2.0.16
-    gtk        >= 3
-    libchewing >= 0.5.1
-   
-1. Remove the old build cache:
-  
-  If you have previous ibus-chewing, or change between ibus 1.1 and ibus 1.2,
-  You may need to remove CMakeCache.txt
 
-2. Extract source and enter the extracted directory, then:
+    meson         >= 0.57.0
+    ibus-1.0      >= 1.3
+    glib-2.0      >= 2
+    gtk4          >= 4
+    libadwaita-1
+    libchewing    >= 0.9.0
+   
+1. Extract source and enter the extracted directory, then:
 
-    cmake -B build . --install-prefix /usr
-    cmake --build build
+    meson setup build --buildtype release --prefix /usr
+    meson compile -C build
 
-3. Install and register schemas:
+2. Install and register schemas:
 
-    sudo cmake --build build -t install
+    sudo meson install -C build
     sudo glib-compile-schemas /usr/share/glib-2.0/schemas/
 
+3. Use iBus UI or run ibus-setup to add ibus-chewing.
 
-4. Use iBus UI or run ibus-setup to add ibus-chewing.
-
-5. Restart iBus and Enjoy!
+4. Restart iBus and Enjoy!
 
     ibus restart
 
-To see other available build targets, use
+To see other available build options, use
 
-    cmake --build build -t help
+    meson configure build

README.md

@@ -14,14 +14,26 @@ Bugs and enhancement can be filed to:
  * [GitHub](https://github.com/chewing/ibus-chewing/issues)
 
 
-ibus-chewing releases can be verified with the following [minisign][] public key
+ibus-chewing releases can be verified with the following OpenPGP public key
+
+ [083B3CAB64267E5BAB7159673EF0C673DADCC30C][pgp_key] Libchewing Signing Key <release@chewing.im>
+
+or the following [minisign][] public key
+
+ RWRzJFnXiLZleAyCIv1talBjyRewelcy9gzYQq9pd3SKSFBPoy57sf5s
 
     RWRzJFnXiLZleAyCIv1talBjyRewelcy9gzYQq9pd3SKSFBPoy57sf5s
 
 For example, to verify the 2.0.0 release
 
-    minisign -Vm ibus-chewing-2.0.0-Source.tar.xz -P RWRzJFnXiLZleAyCIv1talBjyRewelcy9gzYQq9pd3SKSFBPoy57sf5s
+    gpgv ibus-chewing-2.1.7.tar.xz.asc ibus-chewing-2.1.7.tar.xz
+
+or
 
+    minisign -Vm ibus-chewing-2.1.7.tar.xz \
+        -P RWRzJFnXiLZleAyCIv1talBjyRewelcy9gzYQq9pd3SKSFBPoy57sf5s
+
+[pgp_key]: https://chewing.im/.well-known/openpgpkey/hu/y84sdmnksfqswe7fxf5mzjg53tbdz8f5?l=release
 [minisign]: https://jedisct1.github.io/minisign/
 
 # Development
@@ -33,20 +45,14 @@ contribute, please install clang-format and set the git pre-commit hook by:
 ln -s ../../pre-commit .git/hooks/pre-commit
 ```
 
-## For debugging ibus-chewing
+## Debug ibus-chewing
 
-1. Quit existing ibus-daemon
-	* By right click on IBus systray icon, then quit, or
-	* kill the process, or
-	* with command: `ibus exit`
+Run ibus-chewing in command line with verbose debug logging:
 
-2. Edit `/usr/share/ibus/component/chewing.xml`, add `-v 7` to turn verbose level 7
+    G_MESSAGES_DEBUG=ibus-chewing /usr/libexec/ibus-engine-chewing -v 4
 
-3. Run ibus-daemon in command line with following command:
-```
-export G_MESSAGES_DEBUG=all
-ibus-daemon -rvx
-```
+This will temporarily replace the current ibus-chewing engine with
+the one launched from the command line.
 
 # Translation