Add .gitignore

.gitignore

@@ -0,0 +1,17 @@
+# Ignore dotfiles by default
+.*
+
+# Ignore common (generated) file types
+*.a
+*.o
+*.d
+*.so
+*.out
+*.hex
+
+# Ignore bin/ directory
+bin/
+
+# Unignore specific files.
+!.gitignore
+!.clang-format