docs: added docs/cli.md doc

docs/cli.md

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+---
+title: Nano.Community CLI
+description: Documentation for the Nano.Community CLI
+tags: nano, xno, cli, nano-community, alias, representative, metadata, signing key
+---
+
+# Nano.Community CLI
+
+## Installation
+
+### Setting Environment Variables
+
+The best way to pass the private key to the CLI is to set the `NC_CLI_NANO_PRIVATE_KEY` environment variable.
+
+**Linux/Mac:**
+
+```bash
+export NC_CLI_NANO_PRIVATE_KEY='your_private_key_here'
+```
+
+**Windows:**
+
+```cmd
+set NC_CLI_NANO_PRIVATE_KEY=your_private_key_here
+```
+
+## Usage
+
+### Setting up a signing key (optional)
+
+The purpose of a signing key is to sign messages to manage metadata related to a nano account/representative or block while minimizing the exposure of the account private key. This is optional but recommended.
+
+```bash
+nano-cli add-signing-key
+```
+
+This will generate a new signing key and output the public and private keys in the console. Take care to securely store the private key.
+
+This new signing key can now be used in place of your account key. Make sure to replace the `NC_CLI_NANO_PRIVATE_KEY` environment variable with the newly generated private key of the signing key.
+
+#### Revoking a signing key
+
+To revoke a signing key, use the `revoke-signing-key` command. The signing key can be revoked by either the signing key or the account key.
+
+```bash
+nano-cli revoke-signing-key
+```
+
+### Updating Nano Representative Metadata
+
+To update the metadata for a Nano representative use the `update-rep-meta` command.
+
+1. Run the command:
+   ```bash
+   nano-cli update-rep-meta
+   ```
+2. You will be prompted to enter various metadata fields such as alias, description, donation address, etc. Fill these out as required.
+3. Review the entered data when prompted, and confirm to proceed.
+4. The CLI will sign and send the metadata update to the nano.community API, confirming the request in the console output.
+
+### Updating Nano Account Metadata
+
+You can set a public alias for a nano account using the `update-account-meta` command.
+
+```bash
+nano-cli update-account-meta
+```
+
+### Updating Nano Block Metadata
+
+You can set a public message for a nano block using the `update-block-meta` command.
+
+```bash
+nano-cli update-block-meta
+```