Add simple uart driver, more functionality etc etc etc

.gitignore

@@ -0,0 +1,22 @@
+# Build artifacts
+target/
+
+# UEFI boot partition (built output)
+esp/
+
+# QEMU OVMF variable store (written at runtime)
+OVMF_VARS*.fd
+
+# Cargo config is per-machine (custom linker/target settings)
+.cargo/
+
+# Editor / IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS junk
+.DS_Store
+Thumbs.db