add readme

README.md

@@ -1 +1,54 @@
 # flumm-fetch
+
+## Usage Example
+### async / await
+```javascript
+import fetch from "flumm-fetch";
+
+// GET
+(async () => {
+  const query = await fetch("https://example.com/file.json");
+  const result = await query.json();
+  console.log(result);
+})();
+
+// POST
+(async () => {
+  const opts = {
+    method: "POST",
+    body: {
+      name: "John Doe",
+      password: "pwd"
+    }
+  };
+  const query = await fetch("https://example.com/file.json", opts);
+  const result = await query.json();
+  console.log(result);
+})();
+```
+### promises
+```javascript
+import fetch from "flumm-fetch";
+
+// GET
+fetch("https://google.de")
+  .then(res => res.text())
+  .then(res => console.log(res))
+  .catch(console.error);
+
+// POST
+const opts = {
+  method: "POST",
+  body: {
+    name: "John Doe",
+    password: "pwd"
+  }
+};
+fetch("https://google.de", opts)
+  .then(res => res.text())
+  .then(res => console.log(res))
+  .catch(console.error);
+```
+
+## License
+This project is licensed under the MIT license, see [LICENSE](LICENSE).