add examples and README

.gitignore

@@ -1,5 +1,6 @@
 node_modules
 dist
 wrangler.*
+!wrangler.example.toml
 config.json
 config.prod.json

README.md

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+This is a `mod_http_upload_external`-compatible XEP-0363 file server for Prosody and eJabberd implemented on Cloudflare Workers with S3-compatible backend support.
+
+To use it, you need to fill in `config.prod.json` using `config.example.json` as a template, and then create `wrangler.prod.toml` based on `wrangler.example.toml`. Most of the fields should be pretty self-explanatory. To publish it to your Cloudflare account, run `npm run publish-prod`.
+
+To configure eJabberd to use the endpoint exposed by this service, add
+
+```yaml
+  mod_http_upload:
+    put_url: https://<worker_url>/
+    get_url: https://<worker_url>/
+    external_secret: <secret_in_config_json>
+```
+
+to `ejabberd.yaml`.

config.example.json

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+{
+    "xmpp_secret": "<xmpp_secret>",
+    "s3": {
+        "endpoint": "https://<s3_endpoint>",
+        "bucket": "<bucket>"
+    },
+    "aws": {
+        "accessKeyId": "<access_key>",
+        "secretAccessKey": "<secret_key>",
+        "region": "<region>"
+    }
+}

wrangler.example.toml

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+name = ""
+type = "javascript"
+zone_id = ""
+account_id = ""
+route = ""
+workers_dev = true
+
+[build]
+command = "npm install && npm run build"
+[build.upload]
+format = "service-worker"