add VS Code dev container

.devcontainer/Dockerfile

@@ -0,0 +1,3 @@
+FROM mcr.microsoft.com/devcontainers/base:ubuntu
+
+RUN apt-get update && apt-get install -y cc65

.devcontainer/devcontainer.json

@@ -0,0 +1,22 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/debian
+{
+    "name": "cc65 devcontainer",
+    // Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+    "build": {
+        // Path is relative to the devcontainer.json file.
+        "dockerfile": "Dockerfile"
+    }
+
+    // Features to add to the dev container. More info: https://containers.dev/features.
+    // "features": {},
+
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [],
+
+    // Configure tool-specific properties.
+    // "customizations": {},
+
+    // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+    // "remoteUser": "root"
+}

README.md

@@ -28,6 +28,13 @@ then have at it.
    simple as `sudo apt-get install cc65`.
 2. Run `make` from the project root to build the ROM.
 
+#### VS Code Dev Linux Container (from any host OS)
+1. Install/configure [Docker](https://www.docker.com/get-started/)
+2. Install [VS Code](https://code.visualstudio.com/)
+3. Open `Platformer Movement` repo folder in VS Code
+4. Install the Dev Containers extension when prompted (If not already present).
+5. Ctrl-P and select _Dev Containers: Rebuild and Reopen in Container_
+
 ### Code Style
 One of the biggest points of this project is to act as a reference so that folks
 can follow along with the code and learn. As such, keeping the code nice and