docs: add basic doc on development the library (#479)

Author: powersj

docs/development.rst

@@ -0,0 +1,125 @@
+Development
+===========
+
+The following document covers how to develop the InfluxDB client library
+locally. Including how to run tests and build the docs.
+
+.. contents::
+   :local:
+
+tl;dr
+^^^^^
+
+.. code-block:: bash
+
+    # from your forked repo, create and activate a virtualenv
+    python -m virtualenv venv
+    . venv/bin/activate
+    # install the library as editable with all dependencies
+    make install
+    # make edits
+    # run lint and tests
+    make lint test
+
+Getting Started
+^^^^^^^^^^^^^^^
+
+1. Install Python
+
+    Most distributions include Python by default, so before going too far, try
+    running ``python --version`` to see if it already exists. You may
+    also have to specify ``python3 --version``, for example, on Ubuntu.
+
+2. Fork and clone the repo
+
+    The rest of this assumes you have cloned your fork of the upstream
+    `client library <https://github.com/influxdata/influxdb-client-python>`_
+    and are in the same directory of the forked repo.
+
+3. Set up a virtual environment.
+
+    Python virtual environments let you install specific versioned dependencies
+    in a contained manner. This way, you do not pollute or have conflicts on
+    your system with different versions.
+
+    .. code-block:: bash
+
+        python -m virtualenv venv
+        . venv/bin/activate
+
+    Having a shell prompt change via `starship <https://starship.rs/>`_
+    or something similar is nice as it will let you know when and which
+    virtual environment in you are in.
+
+    To exit the virtual environment, run ``deactivate``.
+
+4. Install the client library
+
+    To install the local version of the client library run:
+
+    .. code-block:: bash
+
+        make install
+
+    This will install the library as editable with all dependencies. This
+    includes all dependencies that are used for all possible features as well
+    as testing requirements.
+
+5. Make changes and test
+
+    At this point, a user can make the required changes necessary and run
+    any tests or scripts they have.
+
+    Before putting up a PR, the user should attempt to run the `lint` and `tests`
+    locally. Lint will ensure the formatting of the code, while tests will run
+    integration tests against an InfluxDB instance. For details on that set up
+    see the next section.
+
+    .. code-block:: bash
+
+        make lint test
+
+Linting
+^^^^^^^
+
+The library uses flake8 to do linting and can be run with:
+
+    .. code-block:: bash
+
+        make lint
+
+Testing
+^^^^^^^
+
+The built-in tests assume that there is a running instance of InfluxDB 2.x up
+and running. This can be accomplished by running the
+``scripts/influxdb-restart.sh`` script. It will launch an InfluxDB 2.x instance
+with Docker and make it available locally on port 8086.
+
+Once InfluxDB is available, run all the tests with:
+
+    .. code-block:: bash
+
+        make test
+
+Code Coverage
+-------------
+
+After running the tests, an HTML report of the tests is available in the
+``htmlcov`` directory. Users can open ``html/index.html`` file in a browser
+and see a full report for code coverage across the whole project. Clicking
+on a specific file will show a line-by-line report of what lines were or
+were not covered.
+
+Documentation
+^^^^^^^^^^^^^
+
+The docs are built using Sphinx. To build all the docs run:
+
+    .. code-block:: bash
+
+        make docs
+
+This will build and produce a sample version of the web docs at
+``docs/_build/html/index.html``. From there the user can view the entire site
+and ensure changes are rendered correctly.

docs/index.rst

@@ -10,6 +10,7 @@ InfluxDB 2.0 python client
    api
    api_async
    migration
+   development
 
 .. include:: ../README.rst
   :start-after: marker-index-start