OKRs - 2019 Q2 Go Core Dev (#903)

* OKRs - 2019 Q2 Go Core Dev

## Go IPFS Core Dev OKRs
It's time for us to work on our OKRs for Q2 2019. We should keep in mind our WG goals as expressed in our [roadmap](https://github.com/ipfs/roadmap/blob/roadmap-wg-go-core/WG_GO_CORE.md). We'll use this PR for proposals and discussions of OKRs the next quarter. 

ref #902

- [ ] [Score 2019 Q1 OKRs](https://docs.google.com/spreadsheets/d/1BtOfd7s9oYO5iKsIorCpsm4QuQoIsoZzSz7GItE-9ys/edit?ts=5c2f3d49#gid=1681757723)
- [ ] [Async Retrospective](https://docs.google.com/document/d/14VplImHoUCVJdCMEMr-P9gatt0E1jDuj2ZOQgND_f7U/edit)
- [ ] 2019 Q2 OKRs Open Planning (this thread)
- [ ] Move 2019 Q2 OKRs to [2019 Q1 OKRs Spreadsheet](https://docs.google.com/spreadsheets/d/1YSeyWqXh3ImanRrTkYQHHkCofiORn68bYqM_KTLBlsA/edit#gid=1681757723)

* Update GO_CORE.md

OKR/GO_CORE.md

@@ -2,6 +2,12 @@
 
 We frame our ongoing work using a process based on quarterly Objectives and Key Results (OKRs). Objectives reflect outcomes that are challenging, but realistic. Results are tangible and measurable.
 
+## 2019 Q2
+- [go-ipfs 2019 Q2 OKRs](https://docs.google.com/spreadsheets/d/1YSeyWqXh3ImanRrTkYQHHkCofiORn68bYqM_KTLBlsA/edit#gid=1720716278)
+- [OKR Explanation video](https://www.youtube.com/watch?v=xv5xY-N-2G4&list=PLuhRWgmPaHtRUYCD_RyUw2ldU4lyoSXR1&index=3)
+- [Planning Thread](https://github.com/ipfs/team-mgmt/pull/903)
+- [Previous Quarter Retrospective](https://docs.google.com/document/d/14VplImHoUCVJdCMEMr-P9gatt0E1jDuj2ZOQgND_f7U/edit)
+
 ## 2019 Q1
 
 - [go-ipfs 2019 Q1 OKRs](https://docs.google.com/spreadsheets/d/1BtOfd7s9oYO5iKsIorCpsm4QuQoIsoZzSz7GItE-9ys/edit#gid=1720716278)