Agregando clase 3

Clase 3/Ejercicio/mysql/docker-compose.yaml

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+version: '3.3'
+services:
+  db:
+    image: mysql
+    restart: always
+    environment:
+      MYSQL_ROOT_PASSWORD: password
+    ports:
+      - '3306:3306'
+    expose:
+      - '3306'
+    volumes:
+      - my-db:/var/lib/mysql
+volumes:
+  my-db:
+    external: false #if true will try to find a folder that you set

Clase 3/README.md

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+# Clase 3
+![Diap1](./img/Diap1.png)
+![Diap2](./img/Diap2.png)
+
+![Diap3](../img/Agradecimiento.png)