add cpp26 badge and under dev badge (#163)

* add cpp26 badge and under dev badge

* fix broken linkage

Author: JeffGarland

README.md

@@ -5,6 +5,10 @@ SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 <img src="https://github.com/bemanproject/beman/blob/main/images/logos/beman_logo-beman_library_under_development.png" style="width:5%; height:auto;">
 
+![Library Status](https://raw.githubusercontent.com/bemanproject/beman/refs/heads/main/images/badges/beman_badge-beman_library_under_development.svg)
+![Target Standard](https://github.com/bemanproject/beman/blob/main/images/badges/cpp26.svg)
+
+
 `beman.execution` provides the basic vocabulary for asynchronous
 programming as well as important algorithms implemented in terms
 of this vocabulary. The key entities of the vocabulary are: