Add format script which invokes clang-format on the C++ source code (#41)

On Windows machines, clang-format.exe must be in the PATH environment variable.

wpilibc/Athena/include/Vision/HSLImage.h

@@ -15,6 +15,6 @@
 class HSLImage : public ColorImage {
  public:
   HSLImage();
-  HSLImage(const char *fileName);
+  HSLImage(const char* fileName);
   virtual ~HSLImage() = default;
 };