raposza/tools: README_LONG_TIME.md

<!-- Copyright (c) 2026 bentzn --> <!-- SPDX-License-Identifier: Apache-2.0 --> # Raposza - the long description Developer tooling for teams building applications on Canton. `README.md` is the short front page. `BUILD_AND_INSTALL.md` is the step by step from a clone to a running window. `SECURITY.md