Create README.md

Added a README.

Author: rhymeswithmogul

README.md

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+# PSTimeMachine
+One day, I was so mad at a backup vendor *and* at Windows Server Backup, that I wrote my own simple backup tool in PowerShell.
+
+Apple's Time Machine and <a href="https://git.samba.org/?p=rsync.git"><tt>rsync</tt></a> were the inspirations for this:
+* **Versioned:** Every time the tool runs, a new folder tree is created.
+* **Secure:**    Old backups are never modified by this tool.
+* **Simple:**    It creates entire, browseable folder trees at the destination that require no tools to restore from.
+* **Efficient:** Only changed files are copied from the source to the destination; unchanged files are added with filesystem-level hard links.
+
+## Requirements
+1. The system must be running PowerShell Core or at least Windows PowerShell 5.
+2. Ideally, your backup destination should support hard links.  If not, backups will use a *lot* of space.
+
+## How to Use It
+Like this:
+
+    .\PSTimeMachine.ps1 -SourcePath C:\Shares\SomeShare -DestinationPath D:\BackupsOfSomeShare
+
+For help:
+
+    Get-Help .\PSTimeMachine.ps1
+    
+## Contributing
+Please do!