docs(README): initial version

Author: gr2m

README.md

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+# 🚧 WORK IN PROGRESS [#1](https://github.com/probot/adapter-azure-functions/pull/1)
+
+# `@probot/adapter-azure-functions`
+
+> Adapter to run a [Probot](https://probot.github.io/) application function in [Azure Functions](https://azure.microsoft.com/services/functions/)
+
+[![Build Status](https://github.com/probot/adapter-azure-functions/workflows/Test/badge.svg)](https://github.com/probot/adapter-azure-functions/actions)
+
+## Usage
+
+Create your Probot Application as always
+
+```js
+// app.js
+module.exports = (app) => {
+  app.on("issues.opened", async (context) => {
+    const params = context.issue({ body: "Hello World!" });
+    await context.octokit.issues.createComment(params);
+  });
+};
+```
+
+Then create a folder with `function.json` and `index.js`, e.g.
+
+```js
+// ProbotFunction/function.json
+{
+  "bindings": [
+    {
+      "authLevel": "Anonymous",
+      "type": "httpTrigger",
+      "direction": "in",
+      "name": "req",
+      "methods": ["post"]
+    },
+    {
+      "type": "http",
+      "direction": "out",
+      "name": "res"
+    }
+  ]
+}
+```
+
+and
+
+```js
+// ProbotFunction/index.js
+const {
+  createAzureFunctionsMiddleware,
+  createProbot,
+} = require("@probot/adapter-azure-functions");
+const app = require("../app");
+module.exports = createAzureFunctionsMiddleware(app, {
+  probot: createProbot(),
+});
+```
+
+For an example Probot App continuously deployed to Azure Functions, see https://github.com/probot/example-azure-function/#how-it-works
+
+## How it works
+
+`@probot/adapter-azure-functions` exports everything that [`probot`](https://github.com/probot/probot/#readme) does plus `createAzureFunctionsMiddleware`.
+
+`createAzureFunctionsMiddleware` slightly differs from Probot's built-in `createNodeModdleware`, as an Azure function does receives slightly different parameters.
+
+## License
+
+[ISC](LICENSE)