MAINT: Update build instructions and add test commands in contributio…

…ns guideline

CONTRIBUTING.md

@@ -25,7 +25,15 @@ cd kmertools
 Now build kmertools using cargo. Make sure to have [`rust`](https://docs.conda.io/en/latest/) installed.
 
 ```shell
+# to build the kmertools cli app
 cargo build
+# to build the python wheels
+# pip
+cd pip
+maturin build --release
+# conda
+cd conda 
+maturin build --release
 ```
 
 ## Test kmertools build
@@ -36,6 +44,16 @@ Use the following command to test the build. All tests should pass.
 cargo test
 ```
 
+To test the python bindings, change directory to either `conda` or `pip` then run following commands.
+
+```shell
+cd pip # or cd conda
+maturin develop
+# go to tests folder
+cd ../tests
+pytest -s
+```
+
 ## Coding Style
 
 We use [Clippy](https://doc.rust-lang.org/clippy/) to lint code in kmertools.

README.md

@@ -1,6 +1,6 @@
 # kmertools: DNA Vectorisation Tool
 
-![GitHub License](https://img.shields.io/github/license/anuradhawick/kmertools)
+[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
 [![Cargo tests](https://github.com/anuradhawick/kmertools/actions/workflows/rust_test.yml/badge.svg)](https://github.com/anuradhawick/kmertools/actions/workflows/rust_test.yml)
 [![Clippy check](https://github.com/anuradhawick/kmertools/actions/workflows/clippy_check.yml/badge.svg)](https://github.com/anuradhawick/kmertools/actions/workflows/clippy_check.yml)
 [![install with bioconda](https://img.shields.io/badge/install%20with-bioconda-brightgreen.svg?style=flat)](http://bioconda.github.io/recipes/kmertools/README.html)