Add conda-forge package (#223)

I have added lonboard to conda-forge. This PR adds the conda-forge
installation instruction and conda badges.
https://anaconda.org/conda-forge/lonboard

---------

Co-authored-by: Kyle Barron <kyle@developmentseed.org>

Author: giswqs

README.md

@@ -1,6 +1,7 @@
 # Lonboard
 
 [![PyPI][pypi_badge]][pypi_link]
+[![Conda Version][conda_version_badge]][conda_version]
 [![Binder][binder_badge]][binder_jupyterlab_url]
 [![open_in_colab][colab_badge]][colab_notebook_link]
 
@@ -10,6 +11,8 @@
 [binder_jupyterlab_url]: https://mybinder.org/v2/gh/developmentseed/lonboard/HEAD?urlpath=lab/tree/examples/
 [colab_badge]: https://colab.research.google.com/assets/colab-badge.svg
 [colab_notebook_link]: https://colab.research.google.com/github/developmentseed/lonboard/blob/main
+[conda_version_badge]: https://img.shields.io/conda/vn/conda-forge/lonboard.svg
+[conda_version]: https://anaconda.org/conda-forge/lonboard
 
 A Python library for fast, interactive geospatial vector data visualization in Jupyter.
 
@@ -21,10 +24,18 @@ Building on cutting-edge technologies like [GeoArrow](https://github.com/geoarro
 
 ## Install
 
+To install lonboard using pip:
+
 ```
 pip install lonboard
 ```
 
+Lonboard is on [conda-forge](https://anaconda.org/conda-forge/lonboard) and can be installed using [conda](https://docs.conda.io), [mamba](https://mamba.readthedocs.io/), or [pixi](https://pixi.sh/). To install lonboard using conda:
+
+```
+conda install -c conda-forge lonboard
+```
+
 To install from source, refer to the [developer documentation](https://github.com/developmentseed/lonboard/blob/main/DEVELOP.md).
 
 ## Get Started