Use Signal instead of PGP to contact me securely (#52)

SECURITY.md

@@ -0,0 +1,13 @@
+# Security
+
+To report a vulnerability, please contact Dustin via signal, [`djmitche.78`](https://signal.me/#eu/2T98jpkMAzvFL2wg3OkZnNrfhk1DFfu6eqkMEPqcAuCsLZPVk39A67rp4khmrMNF).
+Initial response is expected within ~48h.
+
+We kindly ask to follow the responsible disclosure model and refrain from sharing information until:
+
+1. Vulnerabilities are patched in `taskchampion-sync-server` + 60 days to coordinate with distributions.
+2. 90 days since the vulnerability is disclosed to us.
+
+We recognise the legitimacy of public interest and accept that security researchers can publish information after 90-days deadline unilaterally.
+
+We will assist with obtaining CVE and acknowledge the vulnerabilities reported.