add example fields

CONTRIBUTING.md

@@ -29,8 +29,8 @@ include, add it in the description field.
 | --- | --- | --- |
 | date | True | While the date may seem trivial, collecting dates may be comlex for multi-day events such as pickets or online petitions. In this repo, we collect only the start date of the action in the format YYYY-MM-DD. |
 | sources | True | The url(s) of reliable sources that has reported on this event. |
-| action | True | What was the form of the action that took place? |
-| struggles | True | The kind of struggle workers are standing up against. | 
+| action | True | What was the form of the action that took place? (`union_drive`, `union_representation`, `open_letter`, `strike`, `protest`)|
+| struggles | True | The kind of struggle workers are standing up against. (`pay_and_benefits`, `working_conditions`, `unfair_labor_practices`, `job_security`, `ethics`, `discrimination`)| 
 | description | True | A short sentence describing the event where you can include information that isn't covered in the fields above. |
 | locations | False | The location(s) of the action, or whether it was online. |
 | companies | False | Which company are workers are standing up against? Some moments of worker power may not have an associated company. For example, online petitions or a protests against the president may consist of workers from an amalgamation of companies. In which case we can omit this field. |
@@ -69,11 +69,11 @@ tag in the README.
   </tr>
   <tr>
    <td class="field-key">action</td>
-   <td class="field-value">Protest</td>
+   <td class="field-value">protest</td>
   </tr>
   <tr>
    <td class="field-key">struggles</td>
-   <td class="field-value">Ethics</td>
+   <td class="field-value">ethics</td>
   </tr>
   <tr>
    <td class="field-key">worker</td>
@@ -89,7 +89,7 @@ tag in the README.
   </tr>
   <tr>
    <td class="field-key">tags</td>
-   <td class="field-value">Protest was not tech worker centric.</td>
+   <td class="field-value">non_tech_centric</td>
   </tr>
  </table>
 ```