Add project logo and update ignore rules

.gitignore

@@ -1,3 +1,4 @@
+# PlatformIO stuff
 .pio/
 .vscode/.browse.c_cpp.db*
 .vscode/c_cpp_properties.json
@@ -8,3 +9,6 @@ sdkconfig.*
 !sdkconfig.defaults
 managed_components/
 compile_commands.json
+
+# Other stuff ;-)
+GPT-logs/

README.md

@@ -1,5 +1,7 @@
 # ESP32 Serial Swiss Army Knife
 
+![ESP32 Serial Swiss Army Knife logo](/images/logo.png "ESP32 Serial Swiss Army Knife")
+
 Universal wireless serial adaptor firmware for the ESP32-S3.
 
 ## Initial hardware target