(BE) User registration / login (#51)

* Add login logic

* Add MongoDB replica dockerfiles

* Add yorkie key for dev

* Implement login logic

backend/docker/mongodb_replica/Dockerfile

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+ARG MONGO_VERSION
+
+FROM mongo:${MONGO_VERSION}
+
+# we take over the default & start mongo in replica set mode in a background task
+ENTRYPOINT mongod --port $MONGO_REPLICA_PORT --replSet rs0 --bind_ip 0.0.0.0 & MONGOD_PID=$!; \
+    # we prepare the replica set with a single node and prepare the root user config
+    INIT_REPL_CMD="rs.initiate({ _id: 'rs0', members: [{ _id: 0, host: '$MONGO_REPLICA_HOST:$MONGO_REPLICA_PORT' }] })"; \
+    # we wait for the replica set to be ready and then submit the command just above
+    until ($MONGO_COMMAND admin --port $MONGO_REPLICA_PORT --eval "$INIT_REPL_CMD"); do sleep 1; done; \
+    # we are done but we keep the container by waiting on signals from the mongo task
+    echo "REPLICA SET ONLINE"; wait $MONGOD_PID;

backend/docker/mongodb_replica/README.md

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+**1. Build Docker Images:**
+
+```bash
+docker-compose build
+```
+
+This command builds the Docker images defined in the `docker-compose.yml` file. Ensure that the MongoDB image (specified as `mymongodb:latest`) is built using the Dockerfile provided earlier.
+
+**2. Run Docker Containers:**
+
+```bash
+docker-compose up -d
+```
+
+This command starts the Docker containers defined in the `docker-compose.yml` file in detached mode (`-d`).
+
+**3. Additional Information:**
+
+-   The `mongodb` service represents the MongoDB container, which is configured to run in replica set mode.
+-   The `mongo-init` service runs a command to initiate the replica set. It sleeps for 5 seconds to allow the MongoDB container to start before executing the initialization script (`init-replica-set.js`).
+-   The MongoDB container exposes port `27017`, and it is mapped to the host port `27017` for external access.
+-   The containers are connected to a custom network named `mynetwork` to enable communication between them.
+
+**Note:** Ensure that you have Docker and Docker Compose installed on your system before executing these commands. Adjust the version numbers in the `docker-compose.yml` file if necessary.

backend/docker/mongodb_replica/docker-compose.yml

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+version: "3.8"
+
+services:
+    # This config is for MongoDB v4
+    # It's a Replica Set (required for Prisma Client)
+    mongo:
+        build:
+            context: ./
+            args:
+                MONGO_VERSION: 4
+        environment:
+            MONGO_REPLICA_HOST: 127.0.0.1
+            MONGO_REPLICA_PORT: 27017
+            # Use "mongosh" instead of "mongo" for v5+
+            MONGO_COMMAND: "mongo"
+        ports:
+            - "27017:27017"
+        restart: unless-stopped
+        healthcheck:
+            # Use "mongosh" instead of "mongo" for v5+
+            test:
+                ["CMD", "mongo", "admin", "--port", "27017", "--eval", "db.adminCommand('ping').ok"]
+            interval: 5s
+            timeout: 2s
+            retries: 20