Include clang-format config and corresponding makefile target

.clang-format

@@ -0,0 +1,19 @@
+BasedOnStyle: LLVM
+IndentWidth: 4
+TabWidth: 4
+UseTab: Never
+ColumnLimit: 120
+AllowShortLoopsOnASingleLine: true
+AllowShortFunctionsOnASingleLine: false
+AlwaysBreakTemplateDeclarations: true
+BreakConstructorInitializers: BeforeComma
+AlignConsecutiveDeclarations:
+  Enabled:         true
+  AcrossEmptyLines: false
+  AcrossComments:  false
+  AlignCompound:   false
+  AlignFunctionPointers: false
+  PadOperators:    false
+AlignConsecutiveMacros: true
+AllowShortCaseLabelsOnASingleLine: true
+SeparateDefinitionBlocks: Always

Makefile

@@ -102,5 +102,10 @@ disasm:	main.elf
 cpp:
 	$(COMPILE) -E $(SOURCEDIR)/main.c
 
+format:
+	find . -type f \( -name '*.c' -o -name '*.h' \) -exec clang-format -i {} +
+
 # include generated header dependencies
 -include $(BUILDDIR)/$(OBJECTS:.o=.d)
+
+.PHONY: format