Deleted useless files such as backend, node_modules and package-lock. Modified readme.

Backend/Models/crop.model.js

@@ -1,22 +0,0 @@
-const mongoose = require("mongoose");
-
-const cropSchema = new mongoose.Schema(
-  {
-    name: { type: String, required: true },
-    farm: { type: mongoose.Schema.Types.ObjectId, ref: "Farm", required: true },
-    image: { type: String },
-    plantedDate: { type: Date, required: true, default: Date.now() },
-    harvestDate: { type: Date },
-    growthStage: {
-      type: String,
-      enum: ["Planted", "Growing", "Ready to Harvest"],
-      default: "Planted",
-    },
-    healthStatus: { type: String, default: "Healthy" },
-  },
-  { timestamps: true }
-);
-
-const Crop = mongoose.model("Crop", cropSchema);
-
-module.exports = Crop;