chore: add readme

README.md

+# feedback
+Feedback tool similar to Google's.
+
+This is a very early alpha version, with a couple of [known issues](#known-issues), a complete rewrite. Should be more performant and less buggy (hopefully).
+
+### Installing
+
+```
+npm i @ivoviz/feedback-js
+```
+
+### Usage
+
+Import and create an instance of `Feedback`:
+```ts
+import { Feedback } from '@ivoviz/feedback.js';
+.
+.
+.
+const feedback = new Feedback();
+feedback.open();
+```
+
+At the moment only two functions are exposed: `open` and `close`, although the latter shouldn't be needed.
+
+Import the stylesheet:
+
+```scss
+@import "~@ivoviz/feedback.js/dist/lib/feedback.css";
+```
+
+There are two optional parameters, `FeedbackOptions` and `HTML2CanvasOptions`.
+
+Currently, the only options supported by `FeedbackOptions` are:
+
+`endpoint`: The url where you want to post the form data. The data will be sent as `json`:
+
+```json
+{
+  "description": "some text",
+  "screenshot": "base64 png"
+}
+```
+
+`allowedTags` _(optional)_: A string array containing the name of the nodes you want to be able to be highlighted on mouseover.
+
+You can read about `HTML2CanvasOptions` here: http://html2canvas.hertzen.com/configuration.
+
+### Known issues
+
+- Missing tooltips for buttons
+- Missing loading animations while sending data or creating screenshot
+- Missing icons
+- Default texts should be written appropriately
+- Not many options at the moment