Added stop words for Tamil lang

[arulrajnet]

Added stop words from

• https://github.com/AshokR/TamilNLP/wiki/Stopwords
• https://cls.corpora.uni-leipzig.de/de/tam_community_2017/3.2.1_The%20Most%20Frequent%2050%20Words.html

[arulrajnet]

@abhinavdangeti could you review this? Is there any other process I have missed in this PR?

[abhinavdangeti]

@arulrajnet Thanks for the contribution.
Here's instructions on how to make your first contribution to the library - https://github.com/blevesearch/bleve/blob/master/CONTRIBUTING.md

[arulrajnet]

@abhinavdangeti Already submitted CLA

Ran go fmt and go vet before given the PR.

[arulrajnet]

@abhinavdangeti Any other process I have to follow to merge this PR.

[sreekanth-cb]

hey @arulrajnet,
I see that you have added stop words for Tamil, but bleve doesn't have a Tamil analyzer yet?
So are you planning to add support/port Tamil analyzer as well Or am I missing the context here?

[arulrajnet]

Yes @sreekanth-cb . I want to add stemmer for Tamil language. Adding stop words is the first step for that. Since most of the lang in bleve at least has stop words.

[sreekanth-cb]

@arulrajnet, let's add some unit tests to this PR then?