intel/blorp: Add a TODO file

This provides a nice little place to share notes on what still needs to be
done and/or would be nice to have in BLORP.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>

src/intel/blorp/TODO

@@ -0,0 +1,16 @@
+Intel BLORP ToDo
+================
+
+Missing features:
+
+ - Splitting larger-than-max blits (Jordan)
+ - Bit-for-bit copies (Jason)
+ - Depth and Stencil clears
+ - Gen4-5 support
+
+Performance:
+
+ - Layered Clears (Topi)
+ - Layered Blits
+ - Avoid re-emitting state for repeated blorp calls
+ - Avoid re-emitting push constant setup