Update README.md

README.md

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-# cpdf
+![version](https://img.shields.io/badge/version-20%2B-E23089)
+![platform](https://img.shields.io/static/v1?label=platform&message=mac-intel%20|%20mac-arm%20|%20win-64&color=blue)
+[![license](https://img.shields.io/github/license/miyako/cpdf)](LICENSE)
+![downloads](https://img.shields.io/github/downloads/miyako/cpdf/total)
+
+### Licensing
+
+* the source code of this component is licensed under the [MIT license](https://github.com/miyako/cpdf/blob/master/LICENSE).
+* see [coherentpdf.com](https://www.coherentpdf.com/index.html) for the licensing of **Coherent PDF**.
+
+# cpdf