docs: Added simple docs and dockerized backend

backend/Dockerfile

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+# Use an official Maven image with Java 17 as the base image
+FROM maven:3.8.4-openjdk-17 AS build
+# Set the working directory in the container
+WORKDIR /app
+# Copy the pom.xml and the project files to the container
+COPY pom.xml .
+COPY src ./src
+# Build the application using Maven
+RUN mvn clean package -DskipTests
+# Use an official OpenJDK image with Java 17 as the base image
+FROM openjdk:17-jdk-slim AS runtime
+# Set the working directory in the container
+WORKDIR /app
+# Copy the built JAR file from the previous stage to the container
+COPY --from=build /app/target/*.jar ./app.jar
+
+EXPOSE 8080
+# Set the command to run the application
+CMD ["java", "-jar", "app.jar"]
+