Added readme for webapp.

webapp/README.md

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+# GFTS webapp
+
+The webapp for this project is being developed in its own repository: [github.com/developmentseed/gfts](https://github.com/developmentseed/gfts).
+
+Here, we will document how to deploy the webapp.
+
+## Container
+
+The webapp can be run in a container. The Dockerfile is in the `webapp/deploy` directory of the repository.
+
+## Deployment
+
+### Infrastructure
+
+As a requirement for the webapp, we need a kubernetes cluster. Then the webapp consists in two parts to:
+
+- terraform/tofu resources for a static floating IP address in `gfts-track-reconstruction/jupyterhub/tofu`
+- helm charts for a configured kubernetes cluster `webapp/deploy/helm`