add devcontainer

bootloader/.devcontainer/Dockerfile

@@ -0,0 +1,10 @@
+FROM ubuntu:22.04
+LABEL authors="Clemens Elflein"
+
+RUN apt-get update && apt-get install -y  \
+    gcc-arm-none-eabi  \
+    cmake \
+    make \
+    && rm -rf /var/lib/apt/lists/*
+
+

bootloader/.devcontainer/devcontainer.json

@@ -0,0 +1,31 @@
+{
+    "build": {
+        "dockerfile": "Dockerfile"
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "ms-vscode.cpptools",
+                "ms-vscode.cpptools-extension-pack",
+                "xaver.clang-format",
+                "twxs.cmake",
+                "ms-vscode.cmake-tools",
+                "marus25.cortex-debug",
+                "mcu-debug.debug-tracker-vscode",
+                "mcu-debug.memory-view",
+                "mcu-debug.peripheral-viewer",
+                "mcu-debug.rtos-views",
+                "ms-vscode.cpptools-themes"
+            ]
+        }
+    },
+    "runArgs": [
+        "--network=host"
+    ],
+    "forwardPorts": [
+        3000
+    ],
+    "mounts": [
+        "source=${localWorkspaceFolderBasename}-build,target=${containerWorkspaceFolder}/build,type=volume"
+    ]
+}