add: docs

PYTHON/INSTALLING_DEPENDENCIES.md

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+# Installing Dependencies
+
+# Updating and Upgrading pip
+
+```sh
+python -m pip install --upgrade pip
+```

PYTHON/PYTHON_TABLE_OF_CONTENTS.md

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+# Python Documentation
+
+## Pages
+
+*  [Setting up a Python Development Environment](SETTING_UP_A_PYTHON_DEVELOPMENT_ENVIRONMENT.md)
+

PYTHON/SETTING_UP_A_PYTHON_DEVELOPMENT_ENVIRONMENT.md

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+# Setting up a Python Development Environment
+
+Creating a virtual environment:
+
+```sh
+python -m venv .venv
+```
+
+Activating the virtual environment:
+
+```sh
+. .venv/bin/activate
+```
+
+# Other Relevant Documentation
+
+[Installing Dependencies](INSTALLING_DEPENDENCIES.md)
+
+[Running python executables under UNIX](RUNNING_PYTHON_EXECUTABLES_UNDER_UNIX.md)