feat: add devcontainers config.

Author: praisetompane

.devcontainer/devcontainer.json

@@ -0,0 +1,15 @@
+{
+	"name": "java",
+	"image": "gradle:jdk21-alpine",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"vscjava.vscode-java-pack"
+			],
+			"settings": {}
+		}
+	},
+	"workspaceMount": "source=${localWorkspaceFolder},target=/java,type=bind,consistency=delegated",
+	"workspaceFolder": "/java",
+	"runArgs": []
+}

.gitignore

@@ -21,4 +21,7 @@
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
-replay_pid*
+replay_pid*
+
+# build
+build/