Add mamba env file (#556)

* Add env file

* Add watermark to environment

* Mention env file in contributing guide

CONTRIBUTING.md

@@ -46,16 +46,16 @@ For more instructions see the [Pull request checklist](#pull-request-checklist)
 
    Always use a feature branch. It's good practice to never routinely work on the `main` branch of any repository.
 
-1. Create an environment. For example:
+1. Create a dedicated development environment from the file present in the repo:
 
     ```bash
-    conda create -n pymc_marketing_env
+    conda env create -f environment.yml
     ```
 
-    Activate the environment.
+    This will create an environment called `pymc-marketing-dev`. Activate the environment.
 
     ```bash
-    conda activate pymc_marketing_env
+    conda activate pymc-marketing-dev
     ```
 
     Install the package (in editable mode) and its development dependencies:

docs/source/index.md

@@ -69,6 +69,9 @@ conda create -c conda-forge -n marketing_env pymc-marketing
 conda activate marketing_env
 ```
 
+### Installation for developers
+If you are a developer of pymc-marketing, or want to start contributing, [refer to the contributing guide](https://github.com/pymc-labs/pymc-marketing/blob/main/CONTRIBUTING.md) to get started.
+
 See the official [PyMC installation guide](https://www.pymc.io/projects/docs/en/latest/installation.html) if more detail is needed.
 
 ## Quickstart

environment.yml

@@ -0,0 +1,40 @@
+# to be used by devs in setting their local environments
+name: pymc-marketing-dev
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+# Base dependencies
+- arviz>=0.13.0
+- matplotlib>=3.5.1
+- numpy>=1.17
+- pandas
+- pip
+# NOTE: Keep minimum pymc version in sync with ci.yml `OLDEST_PYMC_VERSION`
+- pymc>=5.8.2
+- scikit-learn>=1.1.1
+- seaborn>=0.12.2
+- xarray
+- xarray-einstats>=0.5.1
+- watermark
+# Extra dependencies for lint, testing and docs build
+# docs
+- sphinx
+- ipython!=8.7.0
+- myst-parser
+- myst-nb
+- pydata-sphinx-theme>=0.12.0.dev0
+- sphinx-copybutton
+- sphinx-autodoc-typehints
+- sphinxext-opengraph
+- sphinx-notfound-page
+- sphinx-design
+# lint
+- mypy
+- pandas-stubs
+- pre-commit>=2.19.0
+- ruff>=0.1.4
+# test
+- lifetimes==0.11.3
+- pytest==7.0.1
+- pytest-cov==3.0.0