Update DEVELOP.md

DEVELOP.md

@@ -7,6 +7,36 @@ Then install the dependencies and a development instance using:
 ```bash
 make build
 ```
+
+### Start Local Server
+
+Start Plone, on port 8080, with the command:
+
+```bash
+make start
+```
+
+#### Keycloak
+
+The `pas.plugins.oidc` repository has a working setup for a `Keycloak` development server using `Docker` and `Docker Compose`. To use it, in a terminal, run the command:
+
+```bash
+make keycloak-start
+```
+
+There are two realms configured `plone` and `plone-test`. The later is used in automated tests, while the former should be used for your development environment.
+
+The `plone` realm ships with an user that has the following credentials:
+
+* username: **user**
+* password: **12345678**
+
+To stop a running `Keycloak` (needed when running tests), use:
+
+```bash
+make keycloak-stop
+```
+
 ### Update translations
 
 ```bash
@@ -34,3 +64,9 @@ Run all tests but stop on the first error and open a `pdb` session:
 ```bash
 ./bin/tox -e test -- -x --pdb
 ```
+
+Run tests named `TestServiceOIDCPost`:
+
+```bash
+./bin/tox -e test -- -k TestServiceOIDCPost
+```