Populate more of README.md in examples

Author: oleksandr-pavlyk

examples/pybind11/README.md

@@ -1 +1,9 @@
 # Examples of data-parallel Python extensions written with pybind11
+
+The `dpctl` provides integration header `dpctl4pybind11.hpp` which implements type casters
+establishing mapping between `dpctl.SyclQueue` and `sycl::queue`, `dpctl.SyclDevice` and `sycl::device`,
+`dpctl.SyclEvent` and `sycl::event`, etc.
+
+The header also defines C++ classes `dpctl::tensor::usm_ndarray` and `dpctl::memory::usm_memory` which
+derive from `pybind11::object` and encapsulate Python objects of types `dpctl.tensor.usm_ndarray` and
+`dpctl.memory._Memory` respectively.

examples/python/README.md

@@ -0,0 +1 @@
+# Python examples of using `dpctl`