chore(project): update CONTRIBUTING.md

CONTRIBUTING.md

@@ -2,7 +2,7 @@
 
 Some basic conventions for contributing to this project.
 
-### General
+## General
 
 Please make sure that there aren't existing pull requests attempting to address the issue mentioned. Likewise, please check for issues related to update, as someone else may be working on the issue in a branch or fork.
 
@@ -13,7 +13,7 @@ When creating a new branch, prefix it with the *type* of the change (see section
 
 For example, if you work on a bugfix for the issue #361, you could name the branch `fix361-template-selection`.
 
-### Issues open to contribution
+## Issues open to contribution
 
 Want to contribute but don't know where to start?
 
@@ -24,14 +24,14 @@ Some of the open issues are labeled with prefix `exp/`, this is used to mark the
 either AngularJS or Golang
 * **advanced**: a task that require a deep understanding of the project codebase
 
-You can have a use Github filters to list these issues:
+You can use Github filters to list these issues:
 
 * beginner labeled issues: https://github.com/portainer/portainer/labels/exp%2Fbeginner
 * intermediate labeled issues: https://github.com/portainer/portainer/labels/exp%2Fintermediate
 * advanced labeled issues: https://github.com/portainer/portainer/labels/exp%2Fadvanced
 
 
-### Commit Message Format
+## Commit Message Format
 
 Each commit message should include a **type**, a **scope** and a **subject**:
 
@@ -47,7 +47,7 @@ Lines should not exceed 100 characters. This allows the message to be easier to
  #269 style(dashboard): update dashboard with new layout
 ```
 
-#### Type
+### Type
 
 Must be one of the following:
 
@@ -61,16 +61,30 @@ Must be one of the following:
 * **chore**: Changes to the build process or auxiliary tools and libraries such as documentation
   generation
 
-#### Scope
+### Scope
 
 The scope could be anything specifying place of the commit change. For example `networks`,
 `containers`, `images` etc...
 You can use the **area** label tag associated on the issue here (for `area/containers` use `containers` as a scope...)
 
-#### Subject
+### Subject
 
 The subject contains succinct description of the change:
 
 * use the imperative, present tense: "change" not "changed" nor "changes"
 * don't capitalize first letter
 * no dot (.) at the end
+
+## Contribution process
+
+Our contribution process is described below. Some of the steps can be visualized inside Github via specific `contrib/` labels, such as `contrib/func-review-in-progress` or `contrib/tech-review-approved`.
+
+### Bug report
+
+![portainer_bugreport_workflow](https://user-images.githubusercontent.com/5485061/43569306-5571b3a0-9637-11e8-8559-786cfc82a14f.png)
+
+### Feature request
+
+The feature request process is similar to the bug report process but has an extra functional validation before the technical validation.
+
+![portainer_featurerequest_workflow](https://user-images.githubusercontent.com/5485061/43569315-5d30a308-9637-11e8-8292-3c62b5612925.png)