feat: fly io deployment example (#3)

examples/fly.io/README.md

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+# Deploy Jupiter V6 Swap API on Fly.io
+
+https://fly.io/
+
+## To launch an app in fly.io
+
+```
+fly launch
+```
+
+![fly launch ui settings](./fly-launch.png)
+
+<b>Note:</b>
+- Create an app name
+- Recommended size: performance-8x
+
+
+## To do deployment updates, when new new version release
+
+```
+fly deploy
+```

examples/fly.io/fly.toml

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+# fly.toml app configuration file generated for test-jupiter-swap-api on 2023-12-04T14:14:21+08:00
+#
+# See https://fly.io/docs/reference/configuration/ for information about how to use this file.
+#
+
+app = "<APP_NAME>"
+primary_region = "sin"
+
+[build]
+image = "ghcr.io/jup-ag/jupiter-swap-api:latest"
+
+[deploy]
+strategy = "bluegreen"
+
+[env]
+PORT = "8080"
+RPC_URL = "<RPC_URL>"
+# YELLOWSTONE_GRPC_ENDPOINT = "" # Optional 
+# YELLOWSTONE_GRPC_X_TOKEN = "" # Optional
+
+[http_service]
+internal_port = 8080
+auto_stop_machines = true
+auto_start_machines = true
+min_machines_running = 1
+[http_service.concurrency]
+type = "requests"
+hard_limit = 30
+soft_limit = 10
+
+[[http_service.checks]]
+interval = "30s"
+timeout = "5s"
+grace_period = "20s"
+method = "GET"
+path = "/program-id-to-label"
+
+[[vm]]
+cpu_kind = "performance"
+cpus = 8
+memory_mb = 16384