Add steps for publishing new aepp version (#22)

* Add steps for publishing new aepp version

RELEASING_AEPP.md

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+## Publish new version of aepp
+ We are currently using PyPI to for storing and distributing aepp packages, you can find the aepp project in https://pypi.org/project/aepp/. In this document, we will go through the steps for publishing new version of aepp. 
+
+1. Contact the owner @Julien Piccini to add your PyPI account as the collaborator for the aepp project
+2. Set up your api token and save it in your local following the step "To make an API token" in https://pypi.org/help/#apitoken
+3. Update the version in aepp/__version__.py and make necessary changes in setup.py under the project root if your changes require dependency update for aepp
+4. Add a quick note about what has been changed in the new version you plan to publish in aepp/docs/releases.md
+5. Install build and twine in python by running the following command in case you don't have them installed before
+```shell
+pip install build
+pip install twine
+```
+6. Run the command below to generate two files in a dist folder generated under the project root
+```shell
+python -m build
+```
+![release-build.png](docs%2Frelease-build.png)
+7. Upload the two files in dist folder by running the command below
+```shell
+python -m twine upload --repository-url https://upload.pypi.org/legacy/ dist/* 
+```
+When prompted for username, enter `__token__` as username, and use the api token generated in step 2 as password
+![release-upload.png](docs%2Frelease-upload.png)
+8. You can find the latest published aepp from https://pypi.org/project/aepp/#history