feat: Add Docker configuration for Tetris game

.dockerignore

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+.git
+.gitignore
+.dockerignore
+Dockerfile
+README.md
+LICENSE 

Dockerfile

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+# Use the official nginx alpine as the base image for a lightweight container
+# Alpine-based images are smaller in size and more secure
+FROM nginx:alpine
+
+# Set the working directory in the container
+# This is where our application files will be placed
+WORKDIR /usr/share/nginx/html
+
+# Copy all files from the current directory (.) to the working directory in the container (.)
+# This includes HTML, CSS, JavaScript, and other static files
+COPY . .
+
+# Create custom Nginx configuration to listen on port 5000
+RUN echo 'server { \
+    listen 5000; \
+    server_name localhost; \
+    location / { \
+        root /usr/share/nginx/html; \
+        index index.html index.htm; \
+    } \
+}' > /etc/nginx/conf.d/default.conf
+
+# Expose port 5000 for the Nginx web server
+# This matches the port mapping in the docker run command (-p 5000:5000)
+EXPOSE 5000
+
+# Start the Nginx server in the foreground
+# The 'daemon off' directive is required to run nginx in the foreground
+# This is important for Docker containers as they should run in the foreground
+CMD ["nginx", "-g", "daemon off;"]