Update README.md

Added instructions on workarounds for installing palpy and skybright libraries
Added instructions to install models from stable baselines3 contrib like recurrent PPO
Added instructions to run evaluations on saved checkpoints

README.md

@@ -1,6 +1,8 @@
 
 ![status](https://img.shields.io/badge/License-MIT-lightgrey)
 
+# This branch has been tested with Python 3.9
+
 # Summary
 
 This repo is a stripped down version of the main [RLTelescope](https://github.com/deepskies/RLTelescopes); containing just the positioning simulation.
@@ -34,6 +36,25 @@ Otherwise, you can use the `pyproject.toml` with your installer of choice.
 
 To verify all the depedencies are properly installed - run `python run pytest`.
 
+## Install palpy and skybright from source 
+
+## Workaround to Install palpy
+Install from source repository
+Modify setup.py with the following changes
+#sources = ["cpal.pxd", "pal.pyx"]
+sources = ["pal.pyx"]
+
+## Workaround for skybright
+
+convert fit_sky.py from Python2 to Python3
+
+missing apt_pkg.so fix
+$ sudo cp apt_pkg.cpython-38-x86_64-linux-gnu.so /usr/lib/python3/dist-packages/apt_pkg.so
+
+## Installation of stablebaselines3 Recurrent PPO
+
+pip install sb3-contrib
+
 # Example:
 
 ## To run as a live envoriment for RL
@@ -81,6 +102,14 @@ observations = env()
 
 ```
 
+## Evaluate Checkpoints
+
+run the model_test_xxx.py script
+
+Example:  Load a PPO checkpoint
+model_path = f"{models_dir}/710000.zip" #  NEED TO CHANGE PATH FOR CHECKPOIN
+model = PPO.load(model_path, env=env)
+
 
 # Acknowledgement
 And you <3