aptos/contracts: dummy type for wrapped coins

this is used to fill in the CoinType phantom type variable of the Coin
type in the aptos framework to facilitate new coin creation

aptos/coin/Makefile

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+-include ../../Makefile.help
+
+.PHONY: artifacts
+artifacts: build
+
+.PHONY: build
+## Build contract
+build:
+	aptos move compile --save-metadata
+
+.PHONY: test
+## Run tests
+test:
+	aptos move test

aptos/coin/Move.toml

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+[package]
+name = "WrappedCoin"
+version = "0.0.1"
+upgrade_policy = "compatible"
+
+[dependencies]
+MoveStdlib = { git = "https://github.com/aptos-labs/aptos-core.git", subdir = "aptos-move/framework/move-stdlib/", rev = "main" }
+
+[dev-addresses]
+wrapped_coin = "0x0"
+
+[addresses]
+wrapped_coin = "_"

aptos/coin/README.md

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+This package implements the wormhole wrapped coin type.,

aptos/coin/sources/Coin.move

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+module 0xf4f53cc591e5190eddbc43940746e2b5deea6e0e1562b2bba765d488504842c7::coin {
+    struct T has key {}
+}