Document Oasis Core's versioning scheme and release process

[tjanez]

Closes #2457.

[codecov]

Codecov Report

Merging #2565 into master will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2565      +/-   ##
==========================================
+ Coverage    63.5%   63.57%   +0.07%     
==========================================
  Files         346      346              
  Lines       32421    32421              
==========================================
+ Hits        20588    20613      +25     
+ Misses       9261     9230      -31     
- Partials     2572     2578       +6

Impacted Files	Coverage Δ
go/worker/keymanager/service.go	55.55% <0%> (-22.23%)	⬇️
go/worker/common/p2p/p2p.go	64.86% <0%> (-2.71%)	⬇️
go/consensus/tendermint/roothash/roothash.go	68.91% <0%> (-2.63%)	⬇️
go/runtime/client/client.go	69.35% <0%> (-1.62%)	⬇️
go/keymanager/client/client.go	73.86% <0%> (-1.51%)	⬇️
go/consensus/tendermint/abci/mux.go	67.39% <0%> (-0.37%)	⬇️
go/consensus/tendermint/tendermint.go	65.58% <0%> (-0.15%)	⬇️
go/worker/merge/committee/node.go	75.77% <0%> (+0.23%)	⬆️
go/storage/mkvs/urkel/iterator.go	83.76% <0%> (+1.29%)	⬆️
go/storage/api/grpc.go	68.94% <0%> (+1.36%)	⬆️
... and 3 more

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[kostko]

Nice!