Create README.md

Author: rafalkopiec

README.md

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+## mtsp-decoder
+
+This is a Swift-based decoder for the `.mtsp` container, which is designed to be hosted alongside a website's `index.html`. 
+For more information on `.mtsp`, visit [github.com/rafalkopiec/mtsp](https://github.com/rafalkopiec/mtsp).
+
+### Usage:
+- Add `MTSPDecoder` as an SPM dependency.
+- Initialise the `Decoder` class in your data model.
+- Pass in a URL of a metaspace-supported website, such as [https://metaspace.rocks/mtsp](https://metaspace.rocks/mtsp).
+- You will get back an optional `Container` if the download and parsing of the file was successful.
+- The `Decoder` class has a published `containers` dictionary, and the parsed `Container` will be added to that on success.
+- Subscribing to the published dictionary is recommended.
+
+This `MTSPDecoder` swift-package module is minimal, and is covered with unit tests.