start on definitions

Author: MarkMelotto

book/_toc.yml

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       - file: content/workflows/DA.md
 
+    - file: content/glossary/definitions.md
     - file: references.md
     - file: credits.md

book/content/glossary/definitions.md

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+# Definitions eWaterCycle
+
+GRPC4BMI
+: Basic Model Interface is what we use to communicate between the JupyterHub environment and the model containers.
+
+BMI
+: Basic Model Interface — a standardized interface that defines how models expose their variables, time steps, and methods for initialization, updating, and finalization. 
+It allows models to be run and controlled in a consistent way, making them easier to integrate into larger workflows like eWaterCycle.
+
+Containers
+: Lightweight, portable units that package software and its dependencies together, ensuring consistent execution across different computing environments. 
+In eWaterCycle, containers are used to run models reliably and reproducibly, regardless of the underlying system.
+
+
+