chore: Update license headers

feat(README): Add more info to the readme

Signed-off-by: Sophia Koehler <[email protected]>

payment-channel-cc/README.md

@@ -1,9 +1,15 @@
-<h2 align="center">Perun Stellar Example</h2>
+<h2 align="center">Perun Cross Contract Example</h2>
 
-This example shows how to set up a payment channel on Stellar, which utilizes the [go-perun](https://github.com/perun-network/go-perun) channel library, and also the [Stellar payment channel backend](https://github.com/perun-network/perun-stellar-backend).
+This example shows how to set up a payment channel on Stellar and Ethereum, which utilizes the [go-perun](https://github.com/perun-network/go-perun) channel library, and also the [Ethereum payment channel backend](https://github.com/perun-network/perun-eth-backend) and the [Stellar payment channel backend](https://github.com/perun-network/perun-stellar-backend).
 
 # Setup
 
+Navigate to the payment-channel-cc directory and run the following commands to install the dependencies.
+
+```sh
+  go mod tidy
+  go mod vendor
+```
 Spin up the local Stellar blockchain, serving as a local testnet for demonstration purposes.
 
 ```sh
@@ -12,7 +18,7 @@ Spin up the local Stellar blockchain, serving as a local testnet for demonstrati
 
 This will start the Stellar, Horizon and Soroban nodes in the background. This is the platform on which we deploy the Stellar Asset Contract (SAC), and the Perun Payment Channel contract. This allows us to create and utilize L2 channels on Stellar for any customized Stellar asset tokens.
 
-Install [ganache-cli](https://github.com/trufflesuite/ganache-cli) and run
+Install [ganache-cli](https://github.com/trufflesuite/ganache-cli) and open a new terminal to run
 ```sh
 KEY_DEPLOYER=0x79ea8f62d97bc0591a4224c1725fca6b00de5b2cea286fe2e0bb35c5e76be46e
 KEY_ALICE=0x1af2e950272dd403de7a5760d41c6e44d92b6d02797e51810795ff03cc2cda4f
@@ -21,6 +27,7 @@ BALANCE=100000000000000000000
 
 ganache -h 127.0.0.1 --port 8545 --wallet.accounts $KEY_DEPLOYER,$BALANCE $KEY_ALICE,$BALANCE $KEY_BOB,$BALANCE -b 5 
 ```
+This starts a local ganache node with three prefunded accounts. The first account is used to deploy the contract, and the other two are used as Alice and Bob in the example.
 
 # Using the example
 
@@ -30,4 +37,4 @@ You can start the demo by simply running
   go run .
 ```
 
-The accounts for Alice and Bob used in the example are generated randomly and funded at the initialization stage of the demo. 
+The stellar accounts for Alice and Bob used in the example are generated randomly and funded at the initialization stage of the demo. 

payment-channel-cc/client/channel.go

@@ -1,3 +1,17 @@
+// Copyright 2024 PolyCrypt GmbH
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package client
 
 import (

payment-channel-cc/client/client.go

@@ -1,4 +1,4 @@
-// Copyright 2022 PolyCrypt GmbH
+// Copyright 2024 PolyCrypt GmbH
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

payment-channel-cc/client/handle.go

@@ -1,4 +1,4 @@
-// Copyright 2022 PolyCrypt GmbH
+// Copyright 2024 PolyCrypt GmbH
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

payment-channel-cc/client/util.go

@@ -1,4 +1,4 @@
-// Copyright 2022 PolyCrypt GmbH
+// Copyright 2024 PolyCrypt GmbH
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

payment-channel-cc/ethereumUtil/util.go

@@ -1,4 +1,4 @@
-// Copyright 2022 PolyCrypt GmbH
+// Copyright 2024 PolyCrypt GmbH
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

payment-channel-cc/main.go

@@ -1,4 +1,4 @@
-// Copyright 2022 PolyCrypt GmbH
+// Copyright 2024 PolyCrypt GmbH
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

payment-channel-cc/stellarUtil/token.go

@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+
 package stellarUtil
 
 import (