chg: [aks] overall description added

README.md

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+# abstract-key-server (aks)
+
+Abstract key server (aks) is a minimal PGP key server to support communities. aks is a kind of
+read-only OpenPGP key server which is updated by some core administrators of a community. Those
+core administrators can add other trusted aks server to provide lookup of other keys via their server.
+
+This is a work-in-progress to solve specific problems in security and information sharing communities.
+
+## Goals
+
+- Minimal parsing of PGP packets (to reduce complexity and software dependencies)
+- New keys are added via a specific vetted process (or at the discretion of the aks operator)
+- AKS can connect to other trusted list to query unknown keys and there is no reconciliation protocol (by design)
+- Standard HKP interface with `add` method disabled
+- Simple interface to filter out known malicious or rogue PGP keys
+- Fast and reliable
+
+# Requirements
+
+- [ardb](https://github.com/yinqiwen/ardb) as storage back-end
+- Python 3.6
+
+