Make it clear that the dots mean CSS is starting (#102)

* Make it clear that the dots mean CSS is starting

When I ran `./run.sh -d . css --filter=content-negotiation` I was surprised by the number of dots, at how many tests (I thought) there were in the content-negotiation category. But after reading the code of `run.sh`, I realised I had misinterpreted the dots! :)
This extra console message should hopefully make that clearer.

* Mention /etc/hosts edit

* Update README.md

---------

Co-authored-by: Pete Edwards <edwardsph@users.noreply.github.com>

Author: michielbdejong

README.md

@@ -46,6 +46,11 @@ tests available locally.
 For each test subject you want to test, create a `{subject}.env` file in this directory according to the instructions
 [here](https://hub.docker.com/r/solidproject/conformance-test-harness).
 
+If you are testing a local server, add the following line to your `/etc/hosts` file rather than use `http://localhost`:
+```
+127.0.0.1       server
+```
+
 To see the usage instructions:
 ```shell
 ./run.sh

run.sh

@@ -90,6 +90,7 @@ EOF
     --httpsKey=/certs/server.key --httpsCert=/certs/server.cert \
     --port=443 --baseUrl=https://server/
 
+  echo 'Please wait while CSS is starting up'
   until $(curl --output /dev/null --silent --head --fail -k https://server); do
     printf '.'
     sleep 1