feat: add entities

.gitignore

@@ -13,3 +13,5 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+data/
+.idea/

NOTES.md

@@ -0,0 +1,75 @@
+# Ent
+
+## Install
+
+    go get entgo.io/ent/cmd/ent
+
+## Creating entities
+
+    go run entgo.io/ent/cmd/ent init Student Course Lesson Teacher
+
+## Configure entities
+
+- [x] Add fields
+
+- [x] Add relationships 
+
+Execute: 
+
+    go mod tidy
+    go generate ./ent 
+
+to generate the schema files
+
+Let's create an main.go just to test the tabel generation.
+
+
+Install PostgreSQL lib:
+
+    go get github.com/lib/pq
+
+main.go content:
+
+```go
+
+package main
+
+import (
+	"context"
+	"log"
+
+	"github.com/eminetto/go-with-frameworks/ent"
+	_ "github.com/lib/pq"
+)
+
+func main() {
+	client, err := ent.Open("postgres", "host=localhost port=5432 user=prest password=prest dbname=prest sslmode=disable")
+	if err != nil {
+		log.Fatalf("failed opening connection to db: %v", err)
+	}
+	defer client.Close()
+	// Run the auto migration tool.
+	if err := client.Schema.Create(context.Background()); err != nil {
+		log.Fatalf("failed creating schema resources: %v", err)
+	}
+}
+
+```
+
+Execute:
+
+    go run main.go
+
+And check the tables created in the database
+
+
+# UseCases
+
+Create directory:
+
+    mkdir -p usecase/student
+
+Create the interface in `usecase/student/interface.go`:
+
+
+

docker-compose.yml

@@ -0,0 +1,16 @@
+version: "3"
+services:
+  postgres:
+    image: postgres
+    volumes:
+      - "./data/postgres:/var/lib/postgresql/data"
+    environment:
+      - POSTGRES_USER=prest
+      - POSTGRES_DB=prest
+      - POSTGRES_PASSWORD=prest
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready", "-U", "prest"]
+      interval: 30s
+      retries: 3