create readme and deno.json file

deno.json

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+{
+    "tasks": {
+        "start": "deno main.ts"
+    }
+}

readme.md

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+# Detective
+
+Detective is a JavaScript (Deno) program for writing and running interactive
+fiction. The writer creates a JSON document with a specific structure that
+describes rooms, objects, events, etc. They can then run the program with Deno
+and play through the result.
+
+## Installation
+
+Detective is written for [Deno](https://deno.com), which is required. See
+installation instructions
+[here](https://docs.deno.com/runtime/getting_started/installation).
+
+Once you have Deno and the repo, you can run `deno task start` from inside the
+project, and the little demo story should start.
+
+## Commands
+
+Currently, the commands are very simple.
+
+`inventory` checks the players inventory.
+
+`go {direction}` moves the player in the given direction.
+
+`take {item}` picks up the given item.
+
+`use {item}` uses the given item.
+
+`quit` exits the program.
+
+## Writing your own story
+
+The format for the JSON file is shown in more detail in the