updated README to markdown

Author: fed1337

README.md

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+# Lemur
+
+Lemur manages TLS certificate creation. While not able to issue certificates itself, Lemur acts as a broker between CAs
+and environments providing a central portal for developers to issue TLS certificates with 'sane' defaults.
+
+Lemur aims to support the 3 most recent python releases which have been released for at least a year. For example, if python3.13 released last month, we'd aim to support versions 3.10, 3.11, and 3.12.