add devcontainer configuration

.devcontainer/Dockerfile

@@ -0,0 +1,10 @@
+FROM devkitpro/devkitppc:20210726
+
+RUN useradd -ms /bin/bash dev \
+    && usermod -aG sudo dev
+
+RUN echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+
+ENV PATH="${PATH}:/opt/devkitpro/devkitPPC/bin"
+
+CMD ["sleep", "infinity"]

.devcontainer/devcontainer.json

@@ -0,0 +1,14 @@
+{
+    "name": "DevkitPPC",
+    "build": {
+        "dockerfile": "./Dockerfile",
+        "context": "."
+    },
+    "overrideCommand": false,
+    "remoteUser": "dev",
+    "extensions": [
+        "OGoodness.powerpc-syntax",
+        "ms-vscode.makefile-tools",
+        "ms-vscode.cpptools"
+    ]
+}

.vscode/c_cpp_properties.json

@@ -0,0 +1,22 @@
+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "compilerPath": "${DEVKITPPC}/bin/powerpc-eabi-cpp",
+            "cppStandard": "c++11",
+            "includePath": [
+                "${workspaceFolder}/include/**",
+                "${DEVKITPPC}/include/**",
+                "${DEVKITPRO}/portlibs/wii/include/**",
+                "${DEVKITPRO}/portlibs/ppc/include/**",
+                "${DEVKITPRO}/libogc/include/**",
+                "${DEVKITPPC}/lib/gcc/powerpc-eabi/11.1.0/include/**"
+            ],
+            "browse": {
+                "limitSymbolsToIncludedHeaders": true,
+                "databaseFilename": ""
+            }
+        }
+    ],
+    "version": 4
+}