Add initial .gitignore and IDE configuration

.gitignore

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+# Build directory
+build/

.vscode/c_cpp_properties.json

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+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [],
+            "compilerPath": "/bin/arm-none-eabi-gcc",
+            "cStandard": "gnu17",
+            "cppStandard": "gnu++17",
+            "intelliSenseMode": "linux-gcc-x64",
+            "configurationProvider": "ms-vscode.cmake-tools"
+        }
+    ],
+    "version": 4
+}

.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Test",
+            "device": "RP2040",
+            "gdbPath": "gdb-multiarch",
+            "cwd": "${workspaceRoot}",
+            "executable": "${workspaceRoot}/build/test.elf",
+            "request": "launch",
+            "type": "cortex-debug",
+            "servertype": "openocd",
+            "configFiles": [
+                "interface/cmsis-dap.cfg",
+                "target/rp2040-core0.cfg"
+            ],
+            "openOCDLaunchCommands": [
+                "transport select swd",
+                "adapter speed 4000"
+            ],
+            "svdFile": "${env:PICO_SDK_PATH}/src/rp2040/hardware_regs/rp2040.svd",
+            "runToEntryPoint": "main",
+            "postRestartCommands": [
+                "break main",
+                "continue"
+            ]
+        }
+    ]
+}