chore: add readme for modal builder

builder/modal-builder/.env.example

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+MODAL_TOKEN_ID=
+MODAL_TOKEN_SECRET=
+DEPLOY_TEST_FLAG=True

builder/modal-builder/README.md

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+# Modal Builder
+
+This is a standalone docker fast api app that will takes in require snapshot of the machine and build it as a new modal apps and returns back the deployment url.
+
+Environment variable, get it from you [modal accounts](https://modal.com/bennykok/settings/tokens)
+
+```shellscript
+MODAL_TOKEN_ID=
+MODAL_TOKEN_SECRET=
+```
+
+To run locally
+
+```
+docker build -t bennykok/comfydeploy-builder:dev . && docker run --env-file .env -p 8080:8080 bennykok/comfydeploy-builder:dev
+```
+
+To deploy
+
+```
+fly deploy
+```