new: added release doc.

Signed-off-by: Federico Di Pierro <nierro92@gmail.com>

release.md

@@ -0,0 +1,20 @@
+# Release Process
+
+When we release we do the following process:
+
+1. We decide together (usually in the #falco channel in [slack](https://kubernetes.slack.com/messages/falco)) what's the next version to tag
+2. A person with repository rights does the tag
+3. The same person runs commands in their machine following the "Release commands" section below
+4. Once the CI has done its job, the tag is live on [Github](https://github.com/falcosecurity/kernel-testing/releases)
+
+## Release commands
+
+Tag the version, keep the `v` and replace `x.y.z` with the version number. e.g: `0.2.0`
+
+```bash
+git pull
+git checkout master
+git tag vx.y.z
+git push origin vx.y.z
+```
+> N.B.: do NOT use an annotated tag