feat: add readme

README.md

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+<div align="center">
+<h1> dumbserve </h1>
+<p>
+
+**really really really really dumb HTTP file server**
+
+</p>
+
+[![Docker](https://img.shields.io/docker/pulls/realaravinth/dumbserve)](https://hub.docker.com/r/realaravinth/dumbserve)
+[![Build](https://github.com/realaravinth/dumbserve/actions/workflows/linux.yml/badge.svg)](https://github.com/realaravinth/dumbserve/actions/workflows/linux.yml)
+[![dependency status](https://deps.rs/repo/github/realaravinth/dumbserve/status.svg)](https://deps.rs/repo/github/realaravinth/dumbserve)
+[![codecov](https://codecov.io/gh/realaravinth/dumbserve/branch/master/graph/badge.svg)](https://codecov.io/gh/realaravinth/dumbserve)
+
+</div>
+
+## Features
+
+-   [x] Authenticated file uploads
+-   [x] Directors: (auto)create and delete
+-   [x] Serve uploads(public by default)
+
+## Why?
+
+I couldn't find an off-the-shelf software to serve
+[mCaptcha](https://mcaptcha.org) release binaries.