docs: Add README for ciplatforms CLI app

ciplatforms/README.md

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+# ciplatforms
+
+CLI app for collecting CI platform information from GitHub. 🚀
+
+## Overview
+
+The `ciplatforms` CLI app allows users to retrieve CI configuration details for
+GitHub repositories, specifically checking for CI configuration files used by
+popular CI platforms such as:
+
+- **CircleCI**
+- **GitHub Actions**
+- **Taskcluster**
+
+The app processes multiple repositories in batch mode, and it provides options
+for configuring request timeouts and request batch sizes.
+
+## Installation
+
+### Prerequisites
+
+* Go `1.21.3` or newer
+
+### Installation Steps
+
+To install the `ciplatforms` CLI app, run the following command:
+
+```bash
+go install github.com/mozilla-services/rapid-release-model/ciplatforms@latest
+```
+
+## Usage
+
+### Environment Variables
+
+#### GitHub
+
+The following environment variable is required for authentication with the
+GitHub GraphQL API.
+
+Please obtain a GitHub API token with the required scopes (e.g., read-only
+access to the repositories you intend to query).
+
+Then set the environment variable:
+
+```bash
+export CIPLATFORMS_GITHUB_API_TOKEN='[GitHub API token]'
+```
+
+### CLI Commands
+
+The main subcommand is `info`, which retrieves CI platform information for
+GitHub repositories.
+
+To retrieve CI platform information:
+
+```bash
+ciplatforms info --input <input_file> --output <output_file>
+```
+
+Example:
+
+```bash
+ciplatforms info --input services.csv --output services_ciplatforms.json
+```
+
+This command will read repository information for services from `services.csv`,
+query GitHub for CI platform configuration details, and output the results to
+`services_ciplatforms.json`.
+
+### CLI Options
+
+The following options are available for `ciplatforms info`:
+
+| Short Option | Long Option     | Description                                      | Default                                             |
+|--------------|-----------------|--------------------------------------------------|-----------------------------------------------------|
+| `-i`         | `--input`       | Input file containing the list of services       | `services.csv`                                      |
+| `-o`         | `--output`      | Output file for results                          | `services_ciplatforms.csv`                          |
+| `-t`         | `--gh-token`    | GitHub API token for authentication              | `CIPLATFORMS_GITHUB_API_TOKEN` environment variable |
+|              | `--timeout`     | Timeout duration for GitHub API requests         | `10s`                                               |
+|              | `--batch-size`  | Number of repositories to process per batch      | `50`                                                |
+
+
+## Configuration
+
+You can configure the `ciplatforms` CLI app by setting environment variables
+and/or passing CLI flags.
+
+### Input and Output File Formats
+
+* **Input File** (`--input`): The input file should be a CSV file (e.g., `services.csv`) listing the services/repositories to query. Each entry should include the GitHub owner and repository name.
+
+* **Output File** (`--output`): The output file can be specified in either JSON or CSV format. The `ciplatforms` app will determine the output format based on the file extension (`.json` or `.csv`).
+
+Example `services.csv` input file format:
+
+```csv
+service,repository
+monitor,mozilla/blurts-server
+autoconnect,mozilla-services/autopush-rs
+autoendpoint,mozilla-services/autopush-rs
+```
+
+Example JSON output format (`services_ciplatforms.json`):
+
+```json
+[
+  {
+    "service": "monitor",
+    "repository": "mozilla/blurts-server",
+    "circle_ci": false,
+    "gh_actions": true,
+    "taskcluster": false,
+    "accessible": true
+  },
+  {
+    "service": "autoconnect",
+    "repository": "mozilla-services/autopush-rs",
+    "circle_ci": true,
+    "gh_actions": true,
+    "taskcluster": false,
+    "accessible": true
+  },
+  {
+    "service": "autoendpoint",
+    "repository": "mozilla-services/autopush-rs",
+    "circle_ci": true,
+    "gh_actions": true,
+    "taskcluster": false,
+    "accessible": true
+  }
+]
+```
+
+This output provides details about the CI platform configuration status of each
+repository, including its accessibility (a repository may be inaccessible if it
+does not exist or if the provided authentication token lacks access), and flags
+indicating the presence of CircleCI, GitHub Actions, and Taskcluster
+configuration files.