Create codespace config

Author: spenserblack

.devcontainer/Dockerfile

@@ -0,0 +1,3 @@
+ARG VARIANT="1"
+FROM mcr.microsoft.com/devcontainers/rust:${VARIANT}
+RUN apt update && apt install -y cmake

.devcontainer/devcontainer.json

@@ -0,0 +1,16 @@
+{
+  "name": "Rust",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "args": { "VARIANT": "1" }
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "EditorConfig.EditorConfig",
+        "rust-lang.rust-analyzer"
+      ]
+    }
+  },
+  "remoteUser": "vscode"
+}