add devcontainer

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/rust:1.0-1-bullseye
+
+# [Optional] Uncomment this section to install additional OS packages.
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/rust
+{
+	"name": "xrpl-rust",
+	"dockerComposeFile": "docker-compose.yml",
+	"service": "app",
+	"workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+	// Use 'mounts' to make the cargo cache persistent in a Docker Volume.
+	// "mounts": [
+	// 	{
+	// 		"source": "devcontainer-cargo-cache-${devcontainerId}",
+	// 		"target": "/usr/local/cargo",
+	// 		"type": "volume"
+	// 	}
+	// ]
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "rustup --version",
+	// Configure tool-specific properties.
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"Gydunhn.vsc-essentials",
+				"GitHub.copilot",
+				"swellaby.rust-pack",
+				"panicbit.cargo",
+				"vadimcn.vscode-lldb",
+				"tamasfe.even-better-toml"
+			],
+			"settings": {
+				"files.autoSave": "onFocusChange",
+				"files.eol": "\n",
+				"[rust]": {
+					"editor.defaultFormatter": "rust-lang.rust-analyzer",
+					"editor.formatOnSave": true
+				}
+			}
+		}
+	}
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

.devcontainer/docker-compose.yml

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+version: "3"
+
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    command: sleep infinity
+    volumes:
+      - ../..:/workspaces:cached