Add new mamba environment creation command (#49993)

Author: emma-carballal

doc/source/development/contributing_environment.rst

@@ -119,7 +119,7 @@ We'll now kick off a three-step process:
 .. code-block:: none
 
    # Create and activate the build environment
-   mamba env create
+   mamba env create --file environment.yml
    mamba activate pandas-dev
 
    # Build and install pandas