add conda environment for local development

Signed-off-by: Jose Borreguero <borreguero@gmail.com>

conda_enviroment.yml

+name: amaterasu
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - python=3.8
+  - pip
+  - requests
+  - python-dotenv
+  - pip:
+    - slack_bolt