Filled out two more readme files

Author: oleksandr-pavlyk

README.md

@@ -7,5 +7,11 @@ accelerators such as FPGA.
 This collection of examples is part of "[oneAPI for Scientific Python Community][poster]"
 virtual poster by @oleksandr-pavlyk and @diptorupd presented at [SciPy 2022][scipy22] conference.
 
+Two packages `kde_setuptools` and `kde_pybind11` implement the same Kernel Density Estimation
+code executable on SYCL devices supported by DPC++, e.g. Intel CPUs, Intel GPUs.
+
+They only differ in how they are built. One is built with plain `setuptools` while other
+is build with `scikit-build` and uses DPC++ integration with CMake.
+
 [poster]: https://intelpython.github.io/oneAPI-for-SciPy
 [scipy22]: https://www.scipy2022.scipy.org/

kde_skbuild/README.md

@@ -6,4 +6,9 @@ and DCP++ has been activated:
 ```bash
 CC=icx CXX=icpx  python setup.py develop -G Ninja -- -DDCPTL_MODULE_PATH=$(python -m dpctl --cmakedir)
 pytest -m tests
-```
+```
+
+Scikit-build enables building Python native extensions using CMake. This package leverage integration DPC++
+with CMake [dpcpp-cmake-integration] as well as integration of `dpctl` with CMake.
+
+[dpcpp-cmake-integration]: https://www.intel.com/content/www/us/en/develop/documentation/oneapi-dpcpp-cpp-compiler-dev-guide-and-reference/top/compiler-setup/use-the-command-line/use-cmake-with-the-intel-oneapi-dpc-c-compiler.html