docs(LICENSE, README): add contributing guidelines (#6)

LICENSE

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+MIT License
+
+Copyright (c) 2023 ScathachGrip
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+## How to get one?
+
+Pretty simple.
+
+### Step 1 - Create and statically host a website
+
+Find a static site hosting service **GitHub Pages**, **Vercel**, **Netlify**, and create your site.
+
+### Step 2 - Choose your subdomain
+
+According to the existing GitHub Pages URL (for http://foo.github.io/bar, either "foo.merahputih.moe" or "bar.merahputih.moe" would be
+possible).
+
+### Step 3 - Add a CNAME to your repo
+
+Add a file named "CNAME" to your root directory of your repository (or in the
+"gh-pages" branch, if you use that) with a single line matching the domain you
+have chosen (e.g. "foo.merahputih.moe" without quotes). For more info about this step
+you can follow the [Custom URLs](gh-custom-urls) section at GitHub Pages Help.
+
+```diff
++ foo.merahputih.moe
+```
+
+### Step 4 - Claim your subdomain
+
+To finish the procedure, make a pull request in our [GitHub repository][repo]
+that adds your subdomain to the list of existing merahputih.moe domains. Your new URL
+should go live within 24 hours (keep an eye on your pull request in case of a
+naming conflict or a question from our side).
+
+```ts
+import { ICnames } from "./interfaces";
+
+export const data: ICnames = {
+  active: {
+    "bar": "scathachgrip.github.io/bar",
+    "foo": "scathachgrip.github.io/foo", // noProxied
+    // add here as alphabetical order keys
+  }
+};
+```
+If your site throwing an error such as `ERR_TOO_MANY_REDIRECTS` kindly disable proxied by marking your cnames with `//noProxied` comment.
+
+## For advanced users
+
+Our subdomain are _CNAME_ records which map one domain name to another. You can
+actually point your merahputih.moe to many different services that allow custom domain.
+
+## Important
+
+As the owner of the repository, you keep complete control over your published
+content. That also means that all rights and duties that come along with
+publishing a GitHub Page (e.g. GDPR) remain in your responsibility.