Add support for targeting win-arm64

The `ring` crate doesn't natively support win-arm64 yet. But a fork adds that support [as described here][workaround]. [workaround]: briansmith/ring#1514 (comment)
nerdcash · Aug 19, 2023 · 5a69773 · 5a69773
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -20,6 +20,9 @@ tempdir = "0.3"
 portpicker = "0.1"
 incrementalmerkletree = { version = "0.4", features = ["test-dependencies"] }
 
+[patch.crates-io]
+ring = { git = "https://github.com/awakecoding/ring", branch = "0.16.20_alpha" }
+
 [profile.release]
 debug = false
 

diff --git a/README.md b/README.md
@@ -40,6 +40,10 @@ cargo build --release
 
 This will launch the interactive prompt. Type `help` to get a list of commands.
 
+## Library:
+We currently depend on unreleased patches of `ring` for win-arm64 support, via cargo's patching mechanism.
+Because patching only applies at the top level of a project, in order to use this library as a dependency, copy the `[patch.crates-io]` section of `Cargo.toml` into your own workspace `Cargo.toml`
+
 ## Notes:
 * If you want to run your own server, please see [zingo lightwalletd](https://github.com/zingolabs/lightwalletd), and then run `./zingo-cli --server http://127.0.0.1:9067`
 * The default log file is in `~/.zcash/zingo-wallet.debug.log`. A default wallet is stored in `~/.zcash/zingo-wallet.dat`