📝 document requirements and how to run the tests.

README.md

@@ -1,3 +1,24 @@
 # Mordred [![Build Status](https://travis-ci.org/grimoirelab/mordred.svg?branch=master)](https://travis-ci.org/grimoirelab/mordred)
 
 Mordred is the tool used to coordinate the execution of the GrimoireLab platform.
+
+## Requirements
+
+One good way of having an immediate sense of requirements is to look through our [`.travis.yml`](.travis.yml) file to see what our CI does to validate Mordred.
+
+1. Ensure you have all the [supporting systems](https://chaoss.github.io/grimoirelab-tutorial/before-you-start/supporting-systems.html) Mordred needs. In particular, make sure [ElasticSearch is installed and running](https://chaoss.github.io/grimoirelab-tutorial/before-you-start/supporting-systems.html#installing-elasticsearch). (psst: [you can do this via a docker image faster](https://chaoss.github.io/grimoirelab-tutorial/before-you-start/supporting-systems.html#installing-elasticsearch-and-kibana-from-a-docker-container))
+2. Prepare and activate a `python3` virtualenv by following our [tutorial instructions](https://chaoss.github.io/grimoirelab-tutorial/before-you-start/installing-grimoirelab.html#preparing-a-virtualenv).
+3. Install dependencies by following the steps in our [`.travis.yml file`](.travis.yml). At the time of this writing, those are:
+    ```sh
+    pip install pandas==0.18.1
+    pip install httpretty==0.8.6
+    pip install -r "requirements.txt"
+    pip install flake8
+    pip install coveralls
+    ```
+## Testing
+
+```sh
+flake8 .
+cd tests && ./runtests.py
+```