Update .gitignore: Remove bootc/ ignore since it's a submodule

- Remove ./bootc/ from .gitignore since bootc is now a git submodule
- Add standard ignore patterns for temporary files, editor files, OS files
- Add note explaining that bootc/ is a submodule, not ignored

.gitignore

@@ -0,0 +1,22 @@
+# Ignore temporary files and build artifacts
+*.tmp
+*.log
+*.swp
+*.swo
+*~
+
+# Ignore editor-specific files
+.vscode/
+.idea/
+*.sublime-*
+
+# Ignore OS-specific files
+.DS_Store
+Thumbs.db
+
+# Ignore build artifacts if any
+target/
+dist/
+build/
+
+# Note: bootc/ is a git submodule, not ignored