Add README to docs

Signed-off-by: Ryan Friedman <[email protected]>

Author: Ryanf55

README.md

@@ -1,4 +1,5 @@
 # grid_map_geo
+
 [![Build Test](https://github.com/ethz-asl/grid_map_geo/actions/workflows/build_test.yml/badge.svg)](https://github.com/ethz-asl/grid_map_geo/actions/workflows/build_test.yml)
 
 This package provides a georeferenced extension to the elevation map [grid_map](https://github.com/ANYbotics/grid_map) using [GDAL](https://gdal.org/), library for raster and vector geospatial data formats
@@ -8,7 +9,9 @@ This package provides a georeferenced extension to the elevation map [grid_map](
 
 **Authors: Jaeyoung Lim<br />
 Affiliation: [ETH Zurich, Autonomous Systems Lab](https://asl.ethz.ch/)<br />**
+
 ## Setup
+
 Install the dependencies. This package depends on gdal, to read georeferenced images and GeoTIFF files.
 
 Pull in dependencies using rosdep
@@ -23,9 +26,15 @@ Build the package
 ```
 colcon build --cmake-args -DCMAKE_BUILD_TYPE=Release --packages-up-to grid_map_geo
 ```
+
 ## Running the package
+
 The default launch file can be run as the following command. 
 ```
 source install/setup.bash
 ros2 launch grid_map_geo load_tif_launch.xml
 ```
+
+## API Documentation
+
+Documentation for the C++ API in grid_map_geo is [here](https://ethz-asl.github.io/grid_map_geo/index.html).