add more readme

Author: colmazia

packages/vm/fuzz/README.md

@@ -1,6 +1,14 @@
+# Install cargo-fuzz
+
+```sh
+cargo install cargo-fuzz
+```
+
 # Run Fuzz Test
 
+```sh
 cargo fuzz run fuzz_target_1 -- -runs=<number of run limit>
+```
 
 ** Currently, can't run on MacOS because of Sanitizer issue
 For details see https://github.com/google/sanitizers/issues/189