implemented first /sample methods

src/models/note.ts

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+import mongoose from 'mongoose';
+
+const NoteSchema = new mongoose.Schema({
+  comment: String,
+  sample_references: [{
+    id: mongoose.Schema.Types.ObjectId,
+    relation: String
+  }],
+  custom_fields: mongoose.Schema.Types.Mixed
+});
+
+export default mongoose.model('note', NoteSchema);

src/models/note_field.ts

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+import mongoose from 'mongoose';
+
+const NoteFieldSchema = new mongoose.Schema({
+  name: {type: String, index: {unique: true}},
+  qty: Number
+});
+
+export default mongoose.model('note_field', NoteFieldSchema);

src/models/sample.ts

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+import mongoose from 'mongoose';
+
+import MaterialModel from './material';
+import NoteModel from './note';
+import UserModel from './user';
+
+const SampleSchema = new mongoose.Schema({
+  number: {type: String, index: {unique: true}},
+  type: String,
+  color: String,
+  batch: String,
+  validated: Boolean,
+  material_id: {type: mongoose.Schema.Types.ObjectId, ref: MaterialModel},
+  note_id: {type: mongoose.Schema.Types.ObjectId, ref: NoteModel},
+  user_id: {type: mongoose.Schema.Types.ObjectId, ref: UserModel}
+});
+
+export default mongoose.model('sample', SampleSchema);