Add README for manual deployments of deployers

src/deployers/README.md

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+# Deployers
+
+This folder contains deployers that are able to creating contract instances at consistent addresses across networks.
+This is done by using a single use deployment account.
+
+**Note:** Deploying these deployers requires a pre-EIP-155 transaction.
+
+When using these deployer classes, the deployer will automatically be deployed if it is not already present on the network.
+If you prefer to send these transactions manually, please use the information below.
+
+**Note:** As different networks have different gas requirements, additional costs may be required for deployment (e.g. Optimism based chains).
+
+## Manual deployment instructions for the Singleton Deployer
+
+The Singleton Deployer uses [ERC-2470](https://eips.ethereum.org/EIPS/eip-2470).
+
+1. Send `0.0247` of the network native token to the one time use address: `0xBb6e024b9cFFACB947A71991E386681B1Cd1477D`.
+2. Send the transaction: `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`
+
+## Manual deployment instructions for the Universal Deployer
+
+The Universal Deployer uses [Agustin Aguilar's Nano Universal Deployer](https://gist.github.com/Agusx1211/de05dabf918d448d315aa018e2572031).
+
+**Note:** The Universal Deployer class deploys a second deployer with additional functionality. This second deployer does NOT require a per-EIP-155 transaction and so is not listed in these manual instructions.
+
+1. Send `0.02170000000014` of the network native token to the one time use address: `0x9c5a87452d4FAC0cbd53BDCA580b20A45526B3AB`.
+2. Send the transaction: `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`