Write basic README description

README.md

@@ -1,2 +1,4 @@
-# elm-matrix-sdk-beta
-Beta version of the Elm SDK
+# Matrix SDK (beta version)
+
+The Matrix SDK in Elm allows users to communicate with other instances using
+the [Matrix](https://matrix.org) protocol.

elm.json

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+{
+    "type": "package",
+    "name": "noordstar/elm-matrix-sdk-beta",
+    "summary": "Matrix SDK for instant communication. Unstable beta version for testing only.",
+    "license": "EUPL-1.1",
+    "version": "1.0.0",
+    "elm-version": "0.19.0 <= v < 0.20.0",
+    "exposed-modules": [ "Matrix" ],
+    "dependencies": {
+        "elm/core": "1.0.0 <= v < 2.0.0"
+    },
+    "test-dependencies": {}
+}

src/Matrix.elm

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+module Matrix exposing (Vault)
+{-| # Matrix SDK
+
+This first version forms a mere basis from which we will create iterative builds
+that slowly improve the codebase.
+
+It is generally quite unusual to do this on
+the public registry, but it is also generally quite unusual to only support a
+monolithic public registry. (:
+-}
+
+{-| The Vault type stores all relevant information about the Matrix API.
+
+It currently supports no functionality and it will just stay here - for fun.
+-}
+type Vault = Vault