add readme

Closes #5

[CI SKIP]

README.md

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+# Paren
+
+Paren is experemental, radically simple library for parsing and rendering
+information. It consists of two parts: ren (Renderer) and par (Parser)
+
+## Ren Design Principles
+
+- Focused on server-side rendering.
+- Has a very simple interface for creating components.
+- Object-oriented and allows you to change types of rendering without changing
+  components.
+
+## Par
+
+Parser was originally developed for my [personal site](https://pleshevski.ru) to
+use markdown as page content. It's still in the early stages of development, and
+the concept is not well thought out.
+
+# Use Paren
+
+You can try it with [deno](https://deno.land/). Just copy following to your
+`import_map.json`
+
+```json
+{
+  "imports": {
+    "paren/": "https://git.pleshevski.ru/pleshevskiy/paren/raw/commit/ac60fc50bfd4d5027925c9077a016697382c667e/"
+  }
+}
+```
+
+or you can use branch
+`https://git.pleshevski.ru/pleshevskiy/paren/raw/branch/main/`
+
+> **Note**: Use always a specific commit instead of branch
+
+# License
+
+GNU General Public License v3.0 or later
+
+See [COPYING](./COPYING) to see the full text.