Added a readme file

README.md

@@ -0,0 +1,14 @@
+WIP Rust modules for Intel GPUs.
+
+Possibly outdated docs at https://itycodes.org/doc/intel_gpu/ .
+
+Structure:
+- `src/uapi`:
+    low-level ioctl bindings
+- `src/uapi/i915`
+    low-level ioctl bindings specific to i915
+- `src/gpu`
+    low-level OOP wrapper around the ioctl bindings
+- `src/gpu/i915`
+    low-level OOP wrapper around the i915-specific ioctl bindings
+