Add scrapy plugin

plugins/scrapy/README.md

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+## Scrapy zsh completion
+
+Auto completion for scrapy command-line tool
+
+#### commands
+
+``` 
+scrapy [tab]
+
+scrapy commands
+check         -- Check spider contracts,
+crawl         -- Run a spider,
+edit          -- Edit spider,
+fetch         -- Fetch a URL using the Scrapy downloader,
+genspider     -- Generate new spider using pre-defined templates,
+list          -- List available spiders,
+parse         -- Parse URL (using its spider) and print the results,
+runspider     -- Run a self-contained spider (without creating a project),
+settings      -- Get settings values,
+shell         -- Interactive scraping console,
+startproject  -- Create new project,
+version       -- Print Scrapy version,
+view          -- Open URL in browser, as seen by Scrapy
+```
+
+if check/crawl/edit is chosen 
+
+```
+scrapy check [tab]
+dmoz
+```
+
+spiders are listed.