feat: Initialize the VEX feed (#869)

Signed-off-by: GitHub <[email protected]>

.openvex/templates/README.md

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+# OpenVEX Templates Directory
+
+This directory contains the OpenVEX data for this repository.
+The files stored in this directory are used as templates by
+`vexctl generate` when generating VEX data for a release or 
+a specific artifact.
+
+To add new statements to publish data about a vulnerability,
+download [vexctl](https://github.com/openvex/vexctl)
+and append new statements using `vexctl add`. For example:
+```
+vexctl add --in-place main.openvex.json pkg:oci/test CVE-2014-1234567 fixed
+```
+That will add a new VEX statement expressing that the impact of
+CVE-2014-1234567 is under investigation in the test image. When
+cutting a new release, for `pkg:oci/test` the new file will be
+incorporated to the relase's VEX data.
+
+## Read more about OpenVEX
+
+To know more about generating, publishing and using VEX data
+in your project, please check out the vexctl repository and
+documentation: https://github.com/openvex/vexctl
+
+OpenVEX also has an examples repository with samples and docs:
+https://github.com/openvex/examples
+

.openvex/templates/main.openvex.json

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+{
+  "@context": "https://openvex.dev/ns/v0.2.0",
+  "@id": "https://openvex.dev/docs/public/vex-2e0f6a9695a7a992784851dc45be061542fad7863ed8c74449fface40bc67fe3",
+  "author": "vexctl (automated template)",
+  "timestamp": "2023-12-15T18:22:15.804578537Z",
+  "version": 1,
+  "statements": []
+}