Added code space devcontainer (#1)

* Create devcontainer.json

.devcontainer/devcontainer.json

@@ -0,0 +1,6 @@
+{
+  "image": "mcr.microsoft.com/devcontainers/universal:2",
+  "features": {
+  },
+  "postCreateCommand": "chmod +x ./.devcontainer/postcreate.sh && ./.devcontainer/postcreate.sh"
+}

.devcontainer/postcreate.sh

@@ -0,0 +1,27 @@
+mkdir -p ../arm-none-eabi/
+cd ../arm-none-eabi/
+
+if [ ! -f ./arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi.tar.xz ]
+then
+    echo "Downloading arm-none-eabi-gcc"
+    wget https://developer.arm.com/-/media/Files/downloads/gnu/12.3.rel1/binrel/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi.tar.xz
+fi
+
+echo "Unpacking arm-none-eabi-gcc"
+tar xf arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi.tar.xz
+
+sudo rm -f /usr/bin/arm-none-eabi-gcc || true
+sudo rm -f /usr/bin/arm-none-eabi-g++ || true
+sudo rm -f /usr/bin/arm-none-eabi-gdb || true
+sudo rm -f /usr/bin/arm-none-eabi-size || true
+sudo rm -f /usr/bin/arm-none-eabi-objcopy || true
+sudo rm -f /usr/bin/arm-none-eabi-objdump || true
+
+echo "Linking arm-none-eabi"
+
+sudo ln -s `pwd`/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-gcc /usr/bin/arm-none-eabi-gcc 
+sudo ln -s `pwd`/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-g++ /usr/bin/arm-none-eabi-g++
+sudo ln -s `pwd`/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-gdb /usr/bin/arm-none-eabi-gdb
+sudo ln -s `pwd`/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-size /usr/bin/arm-none-eabi-size
+sudo ln -s `pwd`/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-objcopy /usr/bin/arm-none-eabi-objcopy
+sudo ln -s `pwd`/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-objdump /usr/bin/arm-none-eabi-objdump