Added NoteStore interface, mock and repository with Create method

internal/repository/notes.go

@@ -0,0 +1,19 @@
+package repository
+
+import (
+	"fmt"
+
+	"git.hrafn.xyz/aether/notes/internal/models"
+)
+
+type NoteRepository struct {
+	store NoteStore
+}
+
+func NewNoteRepository(store NoteStore) *NoteRepository {
+	return &NoteRepository{store: store}
+}
+
+func (r *NoteRepository) CreateNote(content string) (models.Note, error) {
+	return models.Note{}, fmt.Errorf("not implemented")
+}