Added a README for nightly

[frol]

No description provided.

[codecov]

Codecov Report

Merging #1977 into staging will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           staging    #1977      +/-   ##
===========================================
+ Coverage    86.51%   86.58%   +0.07%     
===========================================
  Files          167      167              
  Lines        31628    31618      -10     
===========================================
+ Hits         27363    27378      +15     
+ Misses        4265     4240      -25

Impacted Files	Coverage Δ
chain/chunks/src/lib.rs	93.6% <0%> (-0.19%)	⬇️
chain/client/src/sync.rs	87.83% <0%> (-0.17%)	⬇️
runtime/near-vm-logic/src/gas_counter.rs	94.2% <0%> (-0.17%)	⬇️
core/store/src/trie/mod.rs	90.01% <0%> (-0.15%)	⬇️
chain/network/src/peer_manager.rs	76.85% <0%> (-0.15%)	⬇️
core/primitives/src/utils.rs	93.77% <0%> (-0.03%)	⬇️
runtime/near-vm-runner/src/cache.rs	100% <0%> (ø)	⬆️
chain/network/src/peer.rs	75% <0%> (+0.19%)	⬆️
chain/chain/src/validate.rs	91.24% <0%> (+0.36%)	⬆️
runtime/near-vm-runner/tests/test_rs_contract.rs	92.92% <0%> (+0.37%)	⬆️
... and 4 more

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