Import documentation: README.MD

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

README.MD

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+Reactor Crawler
+==========
+[![reactor-crw](https://github.com/reactor-joy/reactor-crw/actions/workflows/go.yml/badge.svg)](https://github.com/reactor-joy/reactor-crw/actions/workflows/go.yml)
+[![Go Report Card](https://goreportcard.com/badge/github.com/reactor-joy/reactor-crw)](https://goreportcard.com/report/github.com/reactor-joy/reactor-crw)
+
+Simple CLI content crawler for [Joyreactor](http://joyreactor.cc). He'll find all media content on the 
+page you've provided and save it. If there will be any kind of pagination... he'll go through all pages
+as well unless you'll tell him to not.
+
+<p>
+    <img src="https://i.imgur.com/DjD6cW0.gif" width="800" alt="reactor_crawler_example">
+</p>
+
+## Quick start
+
+Here's the quickest way to download something and test the crawler:
+* Download a build according to your OS.
+* Pick some URL from [Joyreactor](http://joyreactor.cc).
+* Run the crawler `$ reactor-crw -p "http://joyreactor.cc/tag/digital+art"`
+
+## What else
+
+There's a list of optional flags that adds a little more control over the crawler.
+
+```
+$ reactor-crw --help
+
+Allows to quickly download all content by its direct url or entire tag or fandom from joyreactor.cc.
+Example: reactor-crw -d "." -p "http://joyreactor.cc/tag/someTag/all" -w 2 -c "cookie-string"
+
+Usage:
+  reactor-crw [flags]
+
+Flags:
+  -c, --cookie string        User's cookie. Some content may be unavailable without it
+  -d, --destination string   Save path for content. Default value is a user's home folder
+                             (example C:\Users\username for Windows) (default "/home/avpretty")
+  -h, --help                 help for reactor-crw
+  -p, --path string          Provide a full page URL
+  -s, --search string        A comma separated list of content types that should be downloaded.
+                             Possible values: image,gif,webm,mp4. Example: -s "image,webm" (default "image,gif")
+  -o, --single-page          Crawl only one page
+  -w, --workers int          Amount of workers (default 1)
+```
+
+From all flags only `-p --path` is required. All other flags can be omitted and default values will be used.
+
+Here's another example:
+
+```
+$ reactor-crw -p "http://joyreactor.cc/post/000000" -d "." -s "mp4" -o -c "cookies from joyreactor"
+```
+This one will download only `mp4` content from the post and will save it to the current directory.
+`-o` means that only the current page will be parsed, and the user's cookie `-s` will be used by the crawler.
+
+**Note**: some content may be parsed only with user's cookie.