Add base README and configs for mysql & mongo.

.gitignore

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+data

README.md

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+# Local Docker DB
+
+## What?
+A collection of Docker Compose files I've used to quickly spin local databases of various sorts.
+
+## Why?
+Because I've oft needed them, particularly when I just don't wanna deal with the hassle of spinning up a DB on my own system.
+
+## How? 
+Clone the repo or copy a `docker-compose.yml` file to your system, `cd` into that directory, and turn it on with `docker-compose up`. For a full reference on how to use Docker Compose, [go here](https://docs.docker.com/compose/reference/).
+
+## Local Persistence
+In each setup, your data is configured to be stored locally in a `./data` directory. If that directory doesn't exist, it'll be created automatically.

mongo/README.md

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+# Enter the Container w/ Bash
+
+`docker-compose exec --user root db /bin/bash`
+
+# Enter the Mongo Shell
+
+`docker-compose exec --user root db mongo`
+
+# Create a DB w/ User
+
+While in the shell, run the following:
+
+```
+use admin;
+db.auth("user", "password");
+use myDatabase;
+db.createUser({user: "user", pwd: "password", roles:[{role: "readWrite" , db:"myDatabase"}]});
+```

mongo/docker-compose.yml

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+version: '3'
+
+services:
+  db:
+    image: mongo:latest
+    volumes:
+      - ./data:/data/db
+    ports:
+      - 27017:27017
+    environment:
+      MONGO_INITDB_ROOT_USERNAME: user
+      MONGO_INITDB_ROOT_PASSWORD: password

mysql/README.md

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+# Enter the Container w/ Bash
+
+`docker-compose exec --user root db /bin/bash`
+
+# Enter the MySQL Shell
+
+`docker-compose exec --user root db mysql -u root -p`
+
+When prompted, enter `root` as the password. 
+
+# Create a DB
+
+While inside the shell, run the following:
+
+```
+CREATE DATABASE mydatabase;
+```

mysql/docker-compose.yml

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+version: '3'
+
+services: 
+  db:
+    container_name: docker-local-mysql
+    image: mysql:5.7.21
+    volumes:
+      - "./data:/var/lib/mysql"
+    restart: always
+    ports:
+      - 3306:3306
+    environment:
+      MYSQL_ROOT_PASSWORD: root