Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+The following versions of this repository's crates are considered supported,
+and will receive security updates.
+
+__`gitoid`__
+
+| Version          | Supported          |
+|:-----------------| ------------------ |
+| `gitoid-0.4.x`   | :white_check_mark: |
+| `gitoid-0.3.x`   | :x:                |
+
+__`omnibor`__
+
+| Version          | Supported          |
+|:-----------------| ------------------ |
+| `omnibor-0.2.x`  | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+Vulnerabilities can be reported using the "Report a Vulnerability" button under
+the security tab of the repository. If a vulnerability is found to be legitimate,
+a RustSec advisory will be created.
+
+Please give us 90 days to respond to a vulnerability disclosure. In general, we
+will try to be faster than that to produce fixes and respond publicly to
+disclosures.
+
+If we accept the legitimacy of a vulnerability, please wait for us to have
+publcily responded to the vulnerability, including publication of new versions,
+yanking of old versions, and public disclosure in the RustSec database, before
+publicly disclosing the vulnerability yourself.
+
+We ask that you _not_ create advisories yourself, but instead submit
+vulnerability reports to us first so we can plan a response including
+producing any necessary patches, publishing fixed versions, yanking affected
+versions, and communicating about the vulnerability to users.
+
+We consider soundness violations (violations of safe Rust's memory, thread, or
+type safety guarantees) to be at least informational vulnerabilities and
+will treat them as such.
+
+RustSec advisories are automatically imported into the GitHub Security Advisory
+system, and into the OSV database, so duplicate reports do not need to be made
+for those systems.