Add devcontainer configuration (#22)

.devcontainer/devcontainer,json

@@ -0,0 +1,36 @@
+{
+	"name": "Java",
+	"image": "mcr.microsoft.com/vscode/devcontainers/java:0-8",
+	"hostRequirements": {
+		"cpus": 4,
+		"memory": "8gb",
+		"storage": "32gb"
+	},
+	"features": {
+		"ghcr.io/devcontainers/features/java:1.2.1": {
+			"version": "none",
+			"installMaven": "false",
+			"installGradle": "true"
+		}
+	},
+	"postCreateCommand": "java -version",
+	"customizations": {
+		"vscode": {
+			"settings": {
+				"codestream.serverUrl": "https://codestream-api-v2-us1.service.newrelic.com",
+				"diffEditor.codeLens": true,
+				"workbench.colorTheme": "GitHub Dark Default",
+				"remote.extensionKind": {
+					"codestream.codestream": [
+						"workspace"
+					]
+				}
+			},
+			"extensions": [
+				"redhat.java",
+				"codestream.codestream",
+				"ms-azuretools.vscode-docker"
+			]
+		}
+	}
+}