chore: add sign_add_key_functioncall example

Cargo.toml

@@ -59,6 +59,10 @@ path = "examples/sign_transaction/stake.rs"
 name = "sign_add_key_fullaccess"
 path = "examples/sign_transaction/add_key_fullaccess.rs"
 
+[[example]]
+name = "sign_add_key_functioncall"
+path = "examples/sign_transaction/add_key_functioncall.rs"
+
 [[example]]
 name = "blind_sign_transaction"
 

README.md

@@ -141,6 +141,12 @@ RUST_LOG=sign_stake,near_ledger=info cargo run --example sign_stake
 RUST_LOG=sign_add_key_fullaccess,near_ledger=info cargo run --example sign_add_key_fullaccess
 ```
 
+#### Add key (function call)
+
+```bash
+RUST_LOG=sign_add_key_functioncall,near_ledger=info cargo run --example sign_add_key_functioncall
+```
+
 #### Transfer
 
 ```bash

examples/sign_transaction/add_key_functioncall.rs

@@ -0,0 +1,42 @@
+use near_crypto::SecretKey;
+use near_ledger::NEARLedgerError;
+
+#[path = "../common/lib.rs"]
+mod common;
+
+fn tx(ledger_pub_key: ed25519_dalek::PublicKey) -> near_primitives::transaction::Transaction {
+    let mut tx = common::tx_template(ledger_pub_key.clone());
+    let sk = SecretKey::from_seed(
+        near_crypto::KeyType::SECP256K1,
+        &format!("{:?}", ledger_pub_key),
+    );
+    let public_key = sk.public_key();
+    let method_names = vec![
+            "first_method", "saturating_add_signed", "iterator_chain_to_do_multiple_instances_of_an_operation_that_can_fail",
+            "from_residual", "from_output", "unwrap_err_unchecked", "try_reserve_exact",
+            "first_method", "saturating_add_signed", "iterator_chain_to_do_multiple_instances_of_an_operation_that_can_fail",
+        ].into_iter().map(Into::into).collect::<Vec<_>>();
+
+    let permission = near_primitives_core::account::FunctionCallPermission { 
+        allowance: Some(150000000000000000000), 
+        receiver_id: 
+        "dc7e34eecec3096a4a661e10932834f801149c49dba9b93322f6d9de18047f9c1b11b3b31673033936ad07bddc01f9da27d974811e480fb197c799e23480a489".into(), 
+        method_names,   
+    };
+
+
+    tx.actions = vec![near_primitives::transaction::Action::AddKey(Box::new(
+        near_primitives::transaction::AddKeyAction {
+            public_key,
+            access_key: near_primitives_core::account::AccessKey {
+                nonce: 127127127127,
+                permission: near_primitives_core::account::AccessKeyPermission::FunctionCall(permission),
+            },
+        },
+    ))];
+    tx
+}
+
+fn main() -> Result<(), NEARLedgerError> {
+    common::get_key_sign_and_verify_flow(tx)
+}