Initial project setup

- add go.mod and README

README.md

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+# OCSP responder for CAcert
+
+This project aims to provide an OCSP responder implementation for CAcert.
+
+## Requirements
+
+* the sources for OCSP answers should be files
+* certificates that are not listed in those files will be answered as `unknown`
+* the responder must support multiple CA certificates
+* the responder must support multiple OCSP signing certificates
+* responses must be signed
+* responses must contain the signing certificate

go.mod

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+module git.cacert.org/cacert-goocsp
+
+go 1.17