Add security SIG info and notes

Signed-off-by: Riyaz Faizullabhoy <riyaz.faizullabhoy@docker.com>

sigs/README.md

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+# SIGs
+
+This directory will contain the descriptions for LinuxKit special interest groups (SIGs).
+
+The community is welcome to participate in any special interest groups they would like - these meetings are completely
+open to the public. Moreover, it is encouraged that participants suggest meeting agenda points via pull-requests.
+
+Meeting notes will be posted promptly after each SIG meeting in the appropriate subdirectory.

sigs/security/README.md

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+# LinuxKit Security SIG
+
+## Join us!
+- The LinuxKit Security SIG is open to the public and recurs every other Wednesday at 9AM PT: https://docker.zoom.us/j/779801882
+- Moby project forum topic: https://forums.mobyproject.org/c/sig/linuxkit-security
+- #linuxkit channel on [Docker Community Slack](https://dockercommunity.slack.com/messages/C50QFMRC2/) (sign up [here](https://community.docker.com/registrations/groups/4316))
+
+## Goals:
+- Collaborate on security efforts already incubating in the `/projects` subdirectory such as WireGuard, Landlock, and okernel
+- Discuss upstream Linux security
+- Re-implement system daemons in type-safe languages, such as Rust and OCaml
+
+## Meeting Info:
+- Meeting notes and agendas for upcoming meetings are kept in the [/reports/sigs/security directory](../../reports/sigs/security)
+