Add README for ofrak_gpu, compiled futhark code, rename CLI file

ofrak_gpu/.coveragerc

@@ -1,5 +1,5 @@
 [run]
 omit =
     ofrak_gpu/entropy.py
-    ofrak_gpu/run.py
-    ofrak_gpu/bench.py
+    ofrak_gpu/run_entropy.py
+    ofrak_gpu/bench_entropy.py

ofrak_gpu/README.md

@@ -1 +1,25 @@
-# ofrak_gpu
+# OFRAK
+OFRAK (Open Firmware Reverse Analysis Konsole) is a binary analysis and modification platform that combines the ability to unpack, analyze, modify, and repack binaries.
+
+
+# Package: ofrak_gpu
+
+```
+OFRAK
+└───...
+└───ofrak_gpu  <-- //YOU ARE HERE//
+│   └───entropy.fut      // Futhark source code for GPU-bound entropy calculations
+│   └───entropy.py       // Pyopencl equivalent of entropy.fut, generated by the futhark compiler (see "Futhark Compilation")
+│   └───run_entropy.py   // CLI to run compute the entropy of a file
+└───...
+```
+
+This package contains the GPU-bound implementations of expensive computations performed by OFRAK.
+
+## Futhark Compilation
+The [Futhark language](https://futhark-lang.org/) is not required to install and run this module, nor will the Futhark compiler be installed into your Docker container. Instead, `entropy.py`, the compiled pyopencl output of `entropy.fut`, has been provided. If you would like to make any changes to `entropy.fut`, you will have to re-compile `entropy.py` with `futhark pyopencl --library entropy.fut -o entropy.py` - see the `make futhark` target. The `--library` flag must be used.
+## Dependencies
+This package requires numpy, pyopencl, and an OpenCL platform to run. If you don't have an OpenCL platform and want to test your code, consider [oclgrind, pocl, or another pip-installable CPU runtime for OpenCL](https://documen.tician.de/pyopencl/misc.html#enabling-access-to-cpus-and-gpus-via-py-opencl). oclgrind is installed by default by requirements-test to run tests. The Futhark compiler is not required, see "Futhark Compilation."
+
+## Testing
+This package maintains 100% test coverage of functions. See `ofrak_gpu_test`.