Add a patch for zip so ethereum-serai doesn't conflict with Substrate

Also commits the lock file and updates documentation.

.gitignore

@@ -1,2 +1 @@
 target
-Cargo.lock

Cargo.toml

@@ -20,3 +20,6 @@ members = [
 
 [profile.release]
 panic = "unwind"
+
+[patch.crates-io]
+zip = { version = "0.6.2", git = "https://github.com/zip-rs/zip", rev = "bb230ef56adc13436d1fcdfaa489249d119c498f" }

coins/ethereum/LICENSE

@@ -0,0 +1,15 @@
+AGPL-3.0-only license
+
+Copyright (c) 2022 Luke Parker, Elizabeth Binks
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License Version 3 as
+published by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.

coins/ethereum/README.md

@@ -1,21 +1,9 @@
 # Ethereum
 
-This package contains Ethereum-related functionality, specifically deploying and interacting with Serai contracts.
+This package contains Ethereum-related functionality, specifically deploying and
+interacting with Serai contracts.
 
-## Requirements
+### Dependencies
 
-- anvil & solc & geth's abigen (see [here](https://github.com/gakonst/ethers-rs#running-the-tests))
+- solc
-
+- [Foundry](https://github.com/foundry-rs/foundry)
-## To test 
-
-To compile contracts:
-```
-cargo build
-```
-
-This places the compiled artifact into `artifacts/`.
-
-To run Rust tests (you must have compiled the contracts first):
-```
-cargo test
-```