Reorganized API + added db migrations

Read the README file for more informations

backend/api/users/users.go

@@ -0,0 +1,43 @@
+package users
+
+import (
+	"context"
+	"net/http"
+
+	"fr.latosa-escrima/api/core"
+	"fr.latosa-escrima/utils"
+)
+
+func HandleUsers(w http.ResponseWriter, r *http.Request) {
+	var users []core.User
+	count, err := core.DB.NewSelect().
+		Model(&users).
+		ScanAndCount(context.Background())
+
+	users = utils.Map(users, func(user core.User) core.User {
+		user.Password = ""
+		return user
+	})
+
+	if count == 0 {
+		core.JSONSuccess{
+			Status:  core.Success,
+			Message: "No users.",
+		}.Respond(w, http.StatusNotFound)
+		return
+	}
+
+	if err != nil {
+		core.JSONError{
+			Status:  core.Error,
+			Message: err.Error(),
+		}.Respond(w, http.StatusInternalServerError)
+		return
+	}
+
+	core.JSONSuccess{
+		Status:  core.Success,
+		Message: "Users found.",
+		Data:    users,
+	}.Respond(w, http.StatusOK)
+}