glcli: Add README.md

Add a basic README.md file describing the installation process as well
as the basic usage for `glcli`.

Signed-off-by: Peter Neuroth <[email protected]>

libs/gl-cli/README.md

@@ -0,0 +1,143 @@
+# glcli
+
+`glcli` is a command-line interface for running a __Greenlight signer__ and 
+operating a __Greenlight_node__. It is built on top of the `gl-client` library.
+
+## Features
+
+`glcli` is not yet feature-complete but already provides a basic set of
+commands necessary for everyday node operations. Planned future enhancements
+include additional commands and broader integration.
+
+* __Scheduler__: Interact with Greenlight's scheduler to provision and start nodes.
+* __Signer__: Run and interact with a local signer.
+* __Node__: Operate and control a lightning node hosted on Greenlight.
+
+## Installation
+
+Since `glcli` is not yet published on __crates.io__, you can install it locally
+using 
+```bash
+cargo install --path=.
+```
+Run this command from the `glcli` directory.
+
+### Prerequisites
+
+Ensure __Rust__ is installed on your system. If it is not installed, you can set
+it up using [Rustup]("https://rustup.rs/"):
+```bash
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+```
+
+### Build and Install Locally
+
+Navigate to the `glcli` directory and use __Cargo__ to install `glcli` into
+your `CARGO_HOME` (which defaults to `$HOME/.cargo/`):
+```bash
+cargo install --path=.
+```
+Ensure that `CARGO_HOME/bin` is in your `PATH`.
+
+## Usage
+
+After installation, run:
+```bash
+glcli --help
+```
+This will display an overview of the available commands.
+
+By default, `glcli` stores application data in the system's default data 
+directory:
+* __Linux__: `$XDG_DATA_HOME` or `$HOME/.local/share`
+* __macOS__: `$HOME`/Library/Application Support
+
+To specify a custom data directory, use the `--data-dir` or `-d` option. For
+example:
+```bash
+glcli -d "${HOME}/.greenlight_node_1" node getinfo
+```
+
+### Register a Node
+
+Before you can operate a Greenlight node you have to register one. Currently, 
+you need an _invite code_ or a
+[developer certificate]("https://blockstream.github.io/greenlight/getting-started/certs/")
+to register a new node. `glcli` currently supports registration via an
+_invite code_ using the `--invite-code` option:
+```bash
+glcli scheduler register --invite-code=<YOUR_INVITE_CODE>
+```
+
+### Run a Local Signer
+
+To operate your node, you need to attach a local signer to your Greenlight node. 
+The signer is responsible for handling cryptographic signing operations,
+ensuring transaction security and validating requests before granting
+signatures locally.
+
+Start a local signer and attach it to Greenlight by running:
+```bash
+glcli signer run
+```
+
+The signer now listens for incomming requests.
+
+### Operate a Greenlight Node
+
+_(Optional scheduling)_: When executing a `node` command, `glcli` will
+automatically start the node by calling Greenlight's scheduler if necessary. 
+However, you can manually schedule your node in advance by running:
+```bash
+glcli scheduler schedule
+```
+
+Once provisioned, you can interact with your node using `node` subcommands. For
+example to check the node's operational state:
+```bash
+glcli node getinfo
+```
+
+## Advanced Bitcoin Network Configuration
+
+Greenlight supports running nodes on the `bitcoin` and `signet` networks, 
+defaulting to `bitcoin`. To register a Greenlight node on `signet`, use the 
+`--network` option:
+```bash
+glcli --network="signet" scheduler register
+```
+Include the `--network` option in all susequent commands for this node. For
+example:
+```bash
+glcli --network="signet" signer run
+```
+```bash
+glcli --network="signet" node getinfo
+```
+
+_Please note that we __do not__ support `testnet` at the moment. Please open an
+issue describing your use case if you need support for other networks._ 
+
+## Development
+### Build `glcli`
+```bash
+cargo build
+```
+### Run Tests
+```bash
+cargo test
+```
+
+## Contributing
+`glcli` is under active development and currently lacks many major commands from
+[Core-Lightning]("https://github.com/ElementsProject/lightning") such as
+`listinvoices`, `fundchannel`, `close` and `sendpay`. Contributions to
+add these and other missing commands are welcome. If you need a command 
+that is not yet available, feel free to submit a pull request or open an issue 
+describing your use case.
+
+If you encounter any bugs, please report them via an issue or contribute a fix
+through a pull request.
+
+## License
+`glcli` is licensed under the __MIT License__