create steps

backend/models/steps.js

@@ -0,0 +1,20 @@
+function defineStep(sequelize, DataTypes) {
+  const Step = sequelize.define("Step", {
+    step: {
+      type: DataTypes.STRING,
+      allowNull: false,
+    },
+    result: {
+      type: DataTypes.STRING,
+      allowNull: false,
+    },
+  });
+
+  Step.associate = (models) => {
+    Step.belongsToMany(models.Case, { through: "Case_Step" });
+  };
+
+  return Step;
+}
+
+module.exports = defineStep;