Add shields

README.md

@@ -1,5 +1,9 @@
 # run-f
 
+[![License](https://img.shields.io/github/license/minhqdao/run-f?label=License&color=teal)](https://opensource.org/licenses/mit)
+[![Release](https://img.shields.io/github/release/minhqdao/version-f?label=Release)](https://github.com/minhqdao/run-f/releases)
+[![CI](https://github.com/minhqdao/run-f/actions/workflows/ci.yml/badge.svg)](https://github.com/minhqdao/run-f/actions/workflows/ci.yml)
+
 This Fortran library allows you to execute a command in the command line and receive the result as a string without the need for a temporary file.
 
 It was inspired by [this article](https://degenerateconic.com/fortran-c-interoperability.html) and uses `iso_c_binding` to call `popen`, `fgets` and `pclose` from the C standard library.