Adding readme to tar

tar/README.md

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+Helper functions for packing and unpacking tarfiles.
+
+## Usage
+
+```typescript
+import { Tar } from "https://deno.hibas123.de/raw/@denreg-tar";
+
+// The first parameter can be a file or a folder
+await Tar.compress("test.txt", "test.tar");
+await Tar.decompress("test.tar", ".");
+```
+
+Currently containes a version of the <https://deno.land/std/archive/tar.ts> library, but with a fix for subfolders.