add: zerotest README

README.md

@@ -1,2 +1,7 @@
 # research
+![CI Status](https://github.com/supragya/research/actions/workflows/ci.yaml/badge.svg)
+
 A single repository that hosts my "in-code" research of: protocols, ZK, cryptography, rust etc.
+
+## On zero-knowledge and polynomials
+- [univariate-polynomial-iop-zerotest](./univariate-polynomial-iop-zerotest): Polynomial IOP test that $f(x)$'s evaluation on $k$-sized subgroup of a finite field of prime order is all zero.