docs: add README.md for all 3 database services

Author: stark-cybertech

database/chatdb/README.md

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+# Meet@Mensa Chat Database Service
+
+A mysql database for managing chat information
+
+## Local Deployment with Docker
+```
+# Build and tag the Docker image
+docker build -t chatdb .
+
+# Run the Docker container forwarding port 3306 to 3306 and setting the root password via
+docker run --name chatdb-service -e MYSQL_ROOT_PASSWORD=root -p 3306:3306 chatdb .
+
+# List running containers (if needed) 
+docker ps
+
+# Stop the container
+docker stop chatdb-service
+
+# Remove the container
+docker remove chatdb-service
+```
+
+The mysql database will be available on `http://127.0.0.1:3306` with user: `root` and password: `<MYSQL_ROOT_PASSWORD>`.

database/matchdb/README.md

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+# Meet@Mensa Match Database Service
+
+A mysql database for managing matching information
+
+## Local Deployment with Docker
+```
+# Build and tag the Docker image
+docker build -t matchdb .
+
+# Run the Docker container forwarding port 3306 to 3307 and setting the root password via
+docker run --name matchdb-service -e MYSQL_ROOT_PASSWORD=root -p 3306:3307 matchdb .
+
+# List running containers (if needed) 
+docker ps
+
+# Stop the container
+docker stop matchdb-service
+
+# Remove the container
+docker remove matchdb-service
+```
+
+The mysql database will be available on `http://127.0.0.1:3307` with user: `root` and password: `<MYSQL_ROOT_PASSWORD>`.

database/userdb/README.md

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+# Meet@Mensa User Database Service
+
+A mysql database for managing user information
+
+## Local Deployment with Docker
+```
+# Build and tag the Docker image
+docker build -t userdb .
+
+# Run the Docker container forwarding port 3306 to 3308 and setting the root password via
+docker run --name userdb-service -e MYSQL_ROOT_PASSWORD=root -p 3306:3308 userdb .
+
+# List running containers (if needed) 
+docker ps
+
+# Stop the container
+docker stop userdb-service
+
+# Remove the container
+docker remove userdb-service
+```
+
+The mysql database will be available on `http://127.0.0.1:3308` with user: `root` and password: `<MYSQL_ROOT_PASSWORD>`.