Use markdown for README [ci skip]

Github's RST rendering is currently broken [1]: does not support image sizing or multiple images per line.
PyPI now supports markdown, so we can switch to harmonize with TileDB
core repo.

[1] github/markup#295

README.md

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+<a href="https://tiledb.com"><img src="https://github.com/TileDB-Inc/TileDB/raw/dev/doc/source/_static/[email protected]" alt="TileDB logo" width="400"></a>
+
+
+[![Build Status](https://dev.azure.com/TileDB-Inc/CI/_apis/build/status/TileDB-Inc.TileDB-Py?branchName=dev)](https://dev.azure.com/TileDB-Inc/CI/_build/latest?definitionId=1&branchName=dev)
+![](https://raw.githubusercontent.com/TileDB-Inc/TileDB/dev/doc/anaconda.svg?sanitize=true)[![Anaconda download count badge](https://anaconda.org/conda-forge/TileDB-Py/badges/downloads.svg)](https://anaconda.org/conda-forge/TileDB-Py)
+
+
+# TileDB-Py
+
+*TileDB-Py* is a [Python](https://python.org) interface to the [TileDB Storage Engine](https://github.com/TileDB-Inc/TileDB).
+
+# Quick Links
+
+* [Installation](https://docs.tiledb.com/developer/installation/quick-install)
+* [Quickstart](https://docs.tiledb.com/developer/quickstart)
+* [API reference](https://tiledb-inc-tiledb-py.readthedocs-hosted.com/en/stable)
+* [Full developer documentation for all APIs and integrations](https://docs.tiledb.com/developer)
+
+# Quick Installation
+
+TileDB-Py can be installed with either `conda <https://conda.io/docs/>`_ (recommended)::
+
+> conda install -c conda-forge tiledb-py
+
+or ``pip``::
+
+> pip install tiledb