chore(README.md): add badge for example workflow to showcase project'…

…s CI status

docs(README.md): update project description to mention support for NASA / GlobColour / CCI ISIN grid used for MODIS L3BIN satellite products
chore(README.md): remove personal note about it being the author's first rust project

README.md

@@ -1,5 +1,7 @@
 # l3bin for rust
 
+![example workflow](https://github.com/PMassicotte/l3bin/blob/main/.github/workflows/rust.yml/badge.svg)
+
 Support the NASA / GlobColour / CCI ISIN grid used for MODIS L3BIN satellite products. 
 
 This is my first rust project, please be indulgent :)