Adding support for codespaces

Signed-off-by: Alex Yong <alexjyong@gmail.com>

.devcontainer/devcontainer.json

@@ -0,0 +1,23 @@
+{
+    "image": "mcr.microsoft.com/devcontainers/universal:2",
+    "features": {
+      "ghcr.io/devcontainers-community/features/deno:1": {},
+      "ghcr.io/nordcominc/devcontainer-features/android-sdk:1": {
+          "extra_packages": "ndk;28.1.13356709"
+      },
+      "ghcr.io/devcontainers/features/java:1": {
+        "version": "21",
+        "jdkDistro": "oracle"
+      }
+    },
+    "postCreateCommand": "chmod +x gradlew && cp revoltbuild.properties.example revoltbuild.properties && cp sentry.properties.example sentry.properties && git submodule update --init --recursive",
+    "customizations": {
+      "vscode": {
+        "extensions": [
+          "redhat.java",
+          "vscjava.vscode-java-pack",
+          "kotlin.kotlin"
+        ]
+      }
+    }
+  }