Adding a build package documentation page.

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diff --git a/docs/contributor_guide/build_package.md b/docs/contributor_guide/build_package.md
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+Build package
+=============
+
+ArGaze build system is based on [setuptools](https://setuptools.pypa.io/en/latest/userguide/index.html) and [setuptools-scm](https://setuptools-scm.readthedocs.io/en/latest/) to use Git tag as package version number.
+
+!!! note
+
+    *Consider that all inline commands below have to be executed at the root of ArGaze Git repository.*
+
+Install or upgrade the required packages:
+
+```console
+pip install build setuptools setuptools-scm
+```
+
+Commit last changes then, tag the Git repository with a VERSION that follows the [setuptools versionning schemes](https://setuptools.pypa.io/en/latest/userguide/distribution.html):
+
+```console
+git tag -a VERSION -m "Version message"
+```
+
+Push commits and tags:
+
+```console
+git push && git push --tags
+```
+
+Then, build package:
+```console
+python -m build
+```
+
+Once the build is done, two files are created in a *dist* folder:
+
+* **argaze-VERSION-py3-none-any.whl**: the built package (*none* means for no specific OS, *any* means for any architecture).
+* **argaze-VERSION.tar.gz**: the source package.