Add info about traineddata for Romanized Sanskrit - IAST1

Data-Files-Contributions.md

@@ -8,5 +8,6 @@ Such tessdata contributions should ideally document everything needed to reprodu
 |--|--|--|--|--|
 |khmLimon|Khmer|[best](https://github.com/OpenInstituteCambodia/tessdata_best/raw/master/khmLimon.traineddata)|[OpenInstituteCambodia](https://github.com/OpenInstituteCambodia)/[phyrumsk](https://github.com/phyrumsk)|[PR in tessdata_best](https://github.com/tesseract-ocr/tessdata_best/pull/27#issuecomment-394643981)|
 |cop|Coptic|[best](https://github.com/Shreeshrii/tessdata_coptic/raw/master/cop.traineddata)|[shreeshrii/tessdata_coptic](https://github.com/Shreeshrii/tessdata_coptic/)|[tesseract-ocr forum post](https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!topic/tesseract-ocr/LXIxi4KxmNQ)|
+|iast1|Romanized Sanskrit|[best](https://github.com/Shreeshrii/tessdata_sanskrit/iast-plus1)|[shreeshrii/tessdata_sanskrit/](https://github.com/Shreeshrii/tessdata_sanskrit/iast-plus1)|[tesseract-ocr forum post](https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/tesseract-ocr/Ag7btDafRB8/Ag13t4wLCAAJ)|