intial commit

.gitignore

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+temp/*
+vendor/*

README.md

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+# Slack messaging tools
+
+![GitHub release](https://img.shields.io/github/release/FrancoisChaumont/slack-api-tools.svg)
+[![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](https://github.com/FrancoisChaumont/slack-api-tools/issues)
+
+Set of messaging tools using Slack API.
+
+## Requirements
+
+- [Composer](https://getcomposer.org)
+- PHP 7.4+
+
+## Installation
+
+```
+composer install
+```
+
+## Tools
+
+### Post a message to a channel
+See [post-message.php](post-message.php)
+```
+post-messsage.php -h/--help
+```
+See [README.post-message.md](READMEs/README.post-message.md) for more details.
+
+## Built with
+* Visual Studio Code
+
+## Authors
+* **Francois Chaumont** - *Initial work* - [FrancoisChaumont](https://github.com/FrancoisChaumont)
+
+See also the list of [contributors](https://github.com/FrancoisChaumont/db/graphs/contributors) who participated in this project.
+
+## License
+This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for details.
+
+## Notes
+Todo: Add more tools

READMEs/README.post-message.md

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+# Post a message to a Slack channel
+
+## Introduction
+
+**Create a Slack app**     
+See [create app](https://api.slack.com/start/overview#creating) documentation.
+
+Grant permission: `chat:write`
+
+**Sending a message**       
+See [sending message](https://api.slack.com/messaging/sending) documentation.
+
+**Find channel ID**     
+- In the Slack desktop app, right-click on the channel and select copy link. The last part of the URL is the ID.
+- In the browser version, navigate to the channel and check the URL. The last part of the URL is the ID.
+

composer.json

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+{
+    "name": "francoischaumont/slack",
+    "description": "Message functionalities through Slack API and apps",
+    "authors": [
+        {
+            "name": "Francois Chaumont",
+            "role": "main developer"
+        }
+    ],
+    "require": {
+        "php": "^7.4",
+        "guzzlehttp/guzzle": "^7.2"
+    },
+    "autoload": {
+        "psr-4": {
+            "FC\\Slack\\": "src/Slack/"
+        }
+    }
+}