Update poetry instructions in CONTRIBUTING.md (#78)

CONTRIBUTING.md

@@ -9,21 +9,54 @@ If you plan to work on an issue, let us know in the issue thread so we can avoid
 ## Dev Setup
 
 ```bash
-pip -r requirements-dev.txt
-pip install -e entity_gym
-pip install -e enn_ppo  # If you didn't have torch installed already, the torch-scatter install will fail. Just run the install command again.
+poetry install # torch-scatter installation will fail, simply run again
+poetry install # fix torch-scatter installation
 ```
 
+Then you can run the scripts under the poetry environment in two ways: `poetry run` or `poetry shell`. 
+
+* `poetry run`:
+    By prefixing `poetry run`, your command will run in poetry's virtual environment. For example, try running
+    ```bash
+    poetry run python enn_ppo/enn_ppo/train.py
+    ```
+* `poetry shell`:
+    First, activate the poetry's virtual environment by executing `poetry shell`. Then, the name of the poetry's
+    virtual environment (e.g. `(incubator-EKBuw-J_-py3.9)`) should appear in the left side of your shell.
+    Afterwards, you can directly run
+    ```bash
+    python enn_ppo/enn_ppo/train.py
+    ```
+
+See the following video as an example.
+
+[![asciicast](https://asciinema.org/a/452597.svg)](https://asciinema.org/a/452597)
+
 ## Code Formatting
 
 We use [Black](https://black.readthedocs.io/en/stable/) for code formatting.
-You can run `black .` to format all files.
-Make sure that your version of `black` matches the version in [`requirements-dev.txt`]().
+You can run the following to format all files:
+
+```bash
+poetry run black .
+```
 
 ## Running MyPy and Tests
 
 ```bash
-dmypy run -- entity_gym enn_ppo
-pytest .
+poetry run dmypy run -- entity_gym enn_ppo rogue_net
+poetry run pytest .
 ```
 
+
+## Troubleshoot Build Problems
+
+`poetry` sometimes does not play nicely with `conda`. So make sure you run a fresh shell that does not activate any conda environments. If you are running into any other build issues, try the following recommended instructions.
+
+
+* Ubuntu/Debian/Mint:
+```bash
+sudo apt install python3-dev make build-essential libssl-dev zlib1g-dev \
+libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm \
+libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev
+```