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.

Note: The PR #1085 is inative.

Resolve #1085

Adds RuneScape API

Add kroki.io

🐕 Added place.dog to animals section

Added 4chan

Add NLP Cloud

Revert "Added Unixtime conversion service"

Added Unixtime conversion service

Added Thirukkural API in Books category

Resolve #1660

As reported in #1660