You do not need to add your RSS feeds to your feed reader one at a time! That can take ages. Instead, turn your feeds into OPML. OPML (Outline Processor Markup Language) is an XML format that bundles RSS feeds into a single text file. RSS feed readers can import that file and add many feeds at once (hundreds, in my experience, though that takes a while.) You can learn more about the OPML format
here.
Paste your list of RSS feeds into the box, one feed per line, and click the
Generate OPML button. Almost instantly you'll get an OPML file (which is a plain text file) of your RSS feeds.
Please note: All this program does is put the RSS URLs into an OPML file structure. It does not validate the URLs or otherwise assess them. It's up to you to make sure the feeds are valid!