Add instructions, license

LICENSE

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+MIT License
+
+Copyright (c) 2022 Willian Mitsuda
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# What's this?
+
+Do you want to run an archive node + block explorer in your machine using only 1 command and (_almost_) no devops knowledge?
+
+This repo provides a series of pre-configured docker-compose files that spin-up a Prysm (consensus layer client) + Erigon (execution layer archive node; alpha series) + Otterscan (block explorer).
+
+Just follow the instructions, fill in the gaps and run it. Or customize it for your needs. Or improve it and contribute it back, it's all opensource.
+
+> The twitter 🧵 that originated this project: https://twitter.com/wmitsuda/status/1535148383555530757
+
+# Run it
+
+## Post-merge ropsten
+
+1. Clone this repo
+2. Create empty dirs for erigon (`<erigon-data-dir>`) and prysm (`<prysm-data-dir>`) databases
+3. Run: `PRYSM_DATA="<prysm-data-dir>" ERIGON_DATA="<erigon-data-dir>" docker-compose -f ropsten.yml up`
+4. Wait 1-2 days until the archive node finishes syncing ropsten
+5. You should be able to access Otterscan block explorer to browse your archive by accessing: http://localhost:3000/
+
+> Remember that ropsten is deprecated and will have no more upgrades after the merge
+
+## Sepolia
+
+1. Clone this repo
+2. Create an empty dir for erigon (`<erigon-data-dir>`) database
+3. Run: `ERIGON_DATA="<erigon-data-dir>" docker-compose -f sepolia.yml up`
+4. Wait a few hours until the archive node finishes syncing sepolia
+5. You should be able to access Otterscan block explorer to browse your archive by accessing: http://localhost:3000/
+
+> This script will be updated soon as clients gets updated to the upcoming sepolia merge