Merge pull request #531 from argonne-lcf/level-0

Added Level-Zero documentation.

docs/aurora/programming-models/level-0.md

@@ -1,3 +1,42 @@
-# Level 0
+# Level-Zero on Aurora
 
-Placeholder
+## Overview
+
+The objective of the ‘[oneAPI](https://oneapi-spec.uxlfoundation.org/)’
+Level-Zero Application Programming Interface (API) is to provide
+direct-to-metal interfaces to offload accelerator devices.  Its programming
+interface can be tailored to any device needs and can be adapted to support
+broader set of languages features such as function pointers, virtual functions,
+unified memory, and I/O capabilities.
+
+## Setting the environment to use Level-Zero  on Aurora
+
+The Intel Programming Environment is the main environment on Aurora. The Intel
+Compute Runtime is part of this environment and grants access to Level-Zero.
+The Intel Compute Runtime is loaded by default in your environment.
+
+```
+> module list
+
+Currently Loaded Modules:
+  1) gcc/11.2.0                    3) intel_compute_runtime/release/agama-devel-551   5) libfabric/1.15.2.0   7) cray-libpals/1.3.3
+  2) mpich/51.2/icc-all-pmix-gpu   4) oneapi/eng-compiler/2022.12.30.003              6) cray-pals/1.3.3
+
+```
+
+## Building on Aurora
+
+Level-Zero is a C API that can be used in your application by including the
+`ze_api.h` file:
+
+```C
+#include <ze_api.h>
+```
+
+Application that use the Level-Zero API need to be linked to the Level-Zero
+loader library by using the `-lze_loader` linker flag.
+
+## Level-Zero Documentation
+
+The Level-Zero documentation can be found here:
+[Level-Zero Specification](https://oneapi-src.github.io/level-zero-spec).