Add CoinStats API

add autochess vng api

Add NBP currency exchange rates API

Added waifu.pics

Add Visual Crossing Weather API

* Add SpaceTradersAPI

-[x] My submission is formatted according to the guidelines in the contributing guide
-[x] My addition is ordered alphabetically
-[x] My submission has a useful description
-[x] The description does not end with punctuation
-[x] Each table column is padded with one space on either side
-[x] I have searched the repository for any relevant issues or pull requests
-[x] Any category I am creating has the minimum requirement of 3 items
-[x] All changes have been squashed into a single commit

Added Imgflip api

Added Sentiment Analysis Api to Text Analysis

I removed the required lines

Make CONTRIBUTING.md more precise and clear.