add fuzz coverage script

Signed-off-by: Prabhat Verma <[email protected]>

Author: Prabhat1308

contrib/generate_fuzz_coverage.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -e
+set -x
+
+cd fuzz
+export RUSTFLAGS="--cfg=fuzzing --cfg=secp256k1_fuzz --cfg=hashes_fuzz"
+# ignore anything in fuzz directory since we done want coverage of targets 
+cargo llvm-cov --html --ignore-filename-regex "fuzz/"
+
+