Project restructure - moved all module related files to a single file

Added README.md

Author: alan-null

README.md

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+# Slack.Backup
+
+This is a PowerShell module for doing slack history backups.
+
+# Installation
+Module is available on [Powershell Gallery][gallery]
+
+### Install
+```powershell
+PS> Install-Module -Name Slack.Backup
+```
+
+### Import
+```powershell
+PS> Import-Module Slack.Backup
+```
+# Usage
+
+
+```powershell
+PS> Test-Auth -Token "[YOUR_SLACK_API_TOKEN]"
+True
+```
+
+[gallery]: https://www.powershellgallery.com/packages/Slack.Backup