Mention docs in README, add badge for docs, add missing basic_usage.rst

README.rst

@@ -21,6 +21,8 @@
 	   :target: https://github.com/psf/black
 .. image:: https://coveralls.io/repos/github/Happy-Algorithms-League/python-gp/badge.svg?branch=master
 	   :target: https://coveralls.io/github/Happy-Algorithms-League/python-gp?branch=master
+.. image:: https://readthedocs.org/projects/ansicolortags/badge/?version=latest
+	   :target: https://happy-algorithms-league.github.io/hal-cgp/
 
 Cartesian genetic programming (CGP) in pure Python.
 
@@ -36,8 +38,6 @@ Figure from Jordan, Schmidt, Senn & Petrovici, "Evolving to learn: discovering i
 
 .. long-description-end
 
-A simple example of CGP applied to a symbolic regression problem can be found in `examples/example_evo_regression.py`.
-
 .. installation-start
 ============
 Installation
@@ -72,11 +72,14 @@ The adventurous can install the most recent development version directly from ou
 
 .. installation-end
 
-.. basic-usage-start
 ===========
 Basic usage
 ===========
 
+For detailed documentation, please refer to [https://happy-algorithms-league.github.io/hal-cgp/](https://happy-algorithms-league.github.io/hal-cgp/). Here we only provide a preview.
+
+.. basic-usage-start
+
 Follow these steps to solve a basic regression problem:
 
 1. Define an objective function.

docs/basic_usage.rst

@@ -0,0 +1,7 @@
+===========
+Basic usage
+===========
+
+.. include:: ../README.rst
+   :start-after: basic-usage-start
+   :end-before: basic-usage-end