move old resources from protocol toolkit

zero_knowledge/zkEVMs/scroll/README.md

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+## scroll
+
+<br>
+
+### tl; dr
+
+<br>
+
+* scroll is an evm-equivalent zk-rollup to scale ethereum. 
+* the core piece is the zkevm, used to prove correctness of evm execution in layer 2.
+* architecture:
+  * scroll node: constructs l2 blocks from user txs, commit them to the ethereum base layer, and passes messgaes between l1 and l2.
+  * roller network: generates the zkevm validity proofs to prove that txs are executed correctly.
+  * rollup and bridge contracts: provides da for scroll txs, verifies zkevm validity proofs, and allows users to move assets between ethereum and scroll. 
+
+<br>
+
+<p align="center">
+<img width="600" src="https://user-images.githubusercontent.com/1130416/234146949-a523a484-9b24-43aa-93ac-9817ccf6e51d.png">
+</p>
+
+<br>
+
+* the rollers serve as provers in the network, responsible for generating validity for the rollup.
+  * rollers utilize accelerators such as gpus, fpgas, asics.
+  * a roller first converts the execution trace from the coordinator to circuit witnesses.
+  * then generates proofs for each of the zkevm circuits.
+  * finally, it uses proof aggregation to combine proofs from multiple zkevm circuits into a single block proof.
+
+<br>
+
+<p align="center">
+<img width="600"  src="https://user-images.githubusercontent.com/1130416/234150191-a8e9296b-ae52-4f3a-a3d3-b933418ec10d.png">
+</p>
+
+<br>
+
+* workflow of scroll's rollup:
+
+<br>
+
+<p align="center">
+<img width="610" src="https://user-images.githubusercontent.com/1130416/234150359-d612ac1e-e338-45fa-ab8d-f51fd653b6cd.png">
+</p>
+
+<br>
+
+---
+
+### cool resources
+
+<br>
+
+* **[scroll's publications](https://scroll.mirror.xyz/)**