[Project] Update readme && add info about examples

Author: EgorOrachyov

README.md

@@ -85,6 +85,13 @@ If all requirements are satisfied, run the following command to install PyPI pac
 $ python3 -m pip install pycubool
 ``` 
 
+### Documentation
+
+The following links give a brief start guide for new users:
+
+- [C API example](https://github.com/JetBrains-Research/cuBool/blob/master/docs/examples/transitive_closure_cpp.md) - complete C++ application to compute transitive closure of an example graph
+- [Python API usage](https://github.com/JetBrains-Research/cuBool/blob/master/docs/examples/python_examples.md) - complete and detailed set of the python API usage examples for all lib features  
+
 ## Getting started
 
 This section gives instructions to build the library from sources.
@@ -106,7 +113,7 @@ These steps are required if you want to build library for your specific platform
 > without cuda backend support.
 
 Before the CUDA setup process, validate your system NVIDIA driver with `nvidia-smi`
-command. if it is need, install required driver via `ubuntu-drivers devices` and 
+command. Install required driver via `ubuntu-drivers devices` and 
 `apt install <driver>` commands respectively.
 
 The following commands grubs the required GCC compilers for the CC and CXX compiling 
@@ -294,6 +301,7 @@ cuBool
 ├── python - pycubool related sources
 │   ├── pycubool - cubool library wrapper for python (similar to pygraphblas)
 │   ├── tests - regression tests for python wrapper
+│   ├── examples - short script files with python api usage examples
 │   └── data - generate data for pycubool regression tests
 ├── deps - project dependencies
 │   ├── cub - cuda utility, required for nsparse

docs/examples/python_examples.md

@@ -1,5 +1,19 @@
 # Detailed Example
 
+The following set of code snippets demonstrates how to use
+the **pycubool** package primary primitives, operations and features.
+
+This set contains examples of:
+
+- Matrix manipulation
+- Matrix-matrix operations
+- Matrix operations
+- Debug features
+- IO features
+
+These examples require **pycubool** package to installed and the environment properly configured
+accordingly to the main [readme](https://github.com/JetBrains-Research/cuBool/blob/master/README.md) document of the project.
+
 ## Matrix creation example
 ```Python
 """