Added devcontainer and gitignore

.devcontainer/Dockerfile

+# [Choice] Debian OS version (use bullseye on local arm64/Apple Silicon): bookworm, buster, bullseye
+ARG VARIANT="bookworm"
+FROM mcr.microsoft.com/devcontainers/java:17
+
+# [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>
\ No newline at end of file

.devcontainer/devcontainer.json

+{
+    "build": {
+        "dockerfile": "./Dockerfile",
+        "context": ".."
+    },
+    "workspaceFolder": "/workspaces/tnt-crusher-plugin/",
+    "features": {
+        "ghcr.io/devcontainers/features/java:1": {
+            "version": "none",
+            "installGradle": "true",
+            "installMaven": "true"
+        },
+        "ghcr.io/devcontainers/features/git:1": {
+            "version": "latest",
+            "ppa": "false"
+        }
+    },
+    "containerEnv": {
+        "JAVA_HOME": "/usr/lib/jvm/msopenjdk-current"
+    },
+    // Configure tool-specific properties.
+    "customizations": {
+        // Configure properties specific to VS Code.
+        "vscode": {
+            // Set *default* container specific settings.json values on container create.
+            "settings": {},
+            // Add the IDs of extensions you want installed when the container is created.
+            "extensions": [
+                "vscjava.vscode-java-pack"
+            ]
+        }
+    },
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [],
+
+    // Use 'postCreateCommand' to run commands after the container is created.
+    // "postCreateCommand": "java -version",
+
+    // Set `remoteUser` to `root` to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+    "remoteUser": "vscode"
+}
\ No newline at end of file

.gitignore

+target/*
+.vscode
\ No newline at end of file