Implemented NewCategory() method.

pkg/mindflow/database/sqlite/db.go

@@ -182,3 +182,29 @@ func (s *SQLiteMindflow) GetAll() (posts []mindflow.Post, err error) {
 	defer tx.Rollback()
 	return nil, nil
 }
+
+func (s *SQLiteMindflow) NewCategory(name string) (int64, error) {
+	tx, err := s.db.Begin()
+	if err != nil {
+		return 0, err
+	}
+	defer tx.Rollback()
+
+	r, err := tx.Stmt(stmtPostNew).Exec(name)
+	if err != nil {
+		return 0, err
+	}
+
+	id, err := r.LastInsertId()
+	if err != nil {
+		return 0, err
+	}
+
+	tx.Commit()
+
+	return id, nil
+}
+
+func (s *SQLiteMindflow) GetCategoryByID(id int64) (string, error) {
+	return "", nil
+}