Add draft for separated ULC swarm (#254)

* Started with draft of idea for ULC

* Minor changes to set create PR

* Add number of PR

* Better seccess metrics

ideas/254-ultra-light-client/README.md

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+---
+id: 254-ultra-light-client
+title: Integration of ULC in Status
+status: Draft
+created: 2018-05-02
+category: research
+contributors:
+    - themue
+    - jeka
+    - b00ris
+    - zsfelfoldi (external)
+exit-criteria: yes
+success-metrics: yes
+clear-roles: no
+future-iterations: no
+---
+
+## Preamble
+
+    Idea: 254-ultra-light-client
+    Title: Integration of ULC in Status
+    Status: Draft
+    Created: 2018-05-02
+
+## Summary
+
+Current LES is not yet optimized for ultra-light devices like mobile phones. So in the first step introduce
+the ULC addressing this kind of clients.
+
+## Swarm Participants
+
+- Lead Contributor: @themue
+- Testing & Evaluation: TBD
+- Contributor: @jeka
+- Contributor: @b00ris
+- PM: @zsfelfoldi (external)
+- UX (if relevant):
+
+## Product Overview
+
+Current LES is not optimized for usage on mobile phones. So Status is using Infura with all its assets and
+drawbacks. ULC is addressing ultra-light clients and distribution without dependency to central providers.
+Instead a network of trusted LES nodes acts as counterpart for the protocol.
+
+So Status is supporting the development and testing of ULC to accelerate integration into `go-ethereum` as
+well as into Status itself.
+
+### Product Description
+
+- Research of ULC design
+- Definition and implementation of ULC
+- Integrate ULC in `statusd` and the `lib`
+- Documentation
+
+### Minimum Viable Product
+
+Goal Date: 2018-06-30
+
+Description:
+
+- [ ] New Ultra Light Client mode is added to patched LES
+- [ ] Integrate ULC with `status-go` with Status nodes as trusted nodes
+- [ ] Collect metrics (CPU, mem, disk, network I/O) when starting with a branch new install and after 1h of inactivity
+- [ ] Keep battery and network consumption at least as low as today with Infura
+
+### Iteration 1
+
+Goal Date: TBD
+
+Description:
+
+- [ ] Support integration of ULC into `go-ethereum`
+- [ ] Documentation
+
+## Artifacts
+
+- None
+
+## Success Metrics
+
+LES of `go-ethereum` is extended to use ULC with a similar or better use of bandwidth and CPU as Infura.
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
+