chore(examples): add instruction to spin up local ipfs node

Author: cbrzn

examples/README.md

@@ -24,7 +24,10 @@ $ yarn run:http
 
 ## Ipfs
 
-Invoke the IPFS Client wrap; adds file to a local IPFS node, and then retrieves it
+Invoke the IPFS Client wrap; adds file to a local IPFS node, and then retrieves it.
+Before running this example, you must instantiate a local IPFS node by running the following command:
+```
+npx polywrap infra up --modules=eth-ens-ipfs
 ```
 $ yarn run:ipfs
 ```