Make the repository "notebook.link ready" (#1281)

* Make the repository nblink-ready

* Update

* Add README badge

* Point to the first Notebook

Author: martinRenou

.nblink/environment.yml

@@ -0,0 +1,25 @@
+name: default-environment
+channels:
+  - emscripten-forge
+  - conda-forge
+dependencies:
+  - xeus-python
+  - bokeh
+  - cartopy
+  - geopandas
+  - h5netcdf
+  - h5py
+  - imageio
+  - ipyvtklink
+  - jupyter_bokeh
+  - keplergl
+  - laspy
+  - opera-utils
+  - osmnx
+  - pyntcloud
+  - pyvista
+  - requests
+  - rioxarray
+  - rio-cogeo
+  - xarray_leaflet
+  - leafmap>=0.57