Adds configuration for PR title linting app (#606)

Signed-off-by: Marcos Iglesias Valle <golodhros@gmail.com>

.github/PULL_REQUEST_TEMPLATE.md

+<!---
+Provide a general summary of your changes in the Title above
+Include one of these prefixes:
+  fix – Fixes an unexpected problem or unintended behavior
+  feat – Adds a new feature
+  docs – A documentation improvement task
+  build – A task related to our build system
+  ci – A task related to our ci system
+  perf – A performance improvement
+  refactor – A code refactor PR
+  style – A task about styling
+  test – A PR that improve test coverage
+  chore – A regular maintenance chore or task
+  other – Any other kind of PR
+-->
+
 ### Summary of Changes
 
 _Include a summary of changes then remove this line_
@@ -11,11 +27,13 @@ _What tests did you add or modify and why? If no tests were added or modified, e
 _What documentation did you add or modify and why? Add any relevant links then remove this line_
 
 ### CheckList
+
 Make sure you have checked **all** steps below to ensure a timely review.
+
 - [ ] PR title addresses the issue accurately and concisely. Example: "Updates the version of Flask to v1.0.2"
-    - In case you are adding a dependency, check if the license complies with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x).
-- [ ] PR includes a summary of changes, including screenshots of any UI changes. 
-- [ ] PR adds unit tests, updates existing unit tests, __OR__ documents why no test additions or modifications are needed.
+  - In case you are adding a dependency, check if the license complies with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x).
+- [ ] PR includes a summary of changes, including screenshots of any UI changes.
+- [ ] PR adds unit tests, updates existing unit tests, **OR** documents why no test additions or modifications are needed.
 - [ ] In case of new functionality, my PR adds documentation that describes how to use it.
-    - All the public python functions and the classes in the PR contain docstrings that explain what it does
+  - All the public python functions and the classes in the PR contain docstrings that explain what it does
 - [ ] PR passes all tests documented in the [developer guide](https://github.com/lyft/amundsenfrontendlibrary/blob/master/docs/developer_guide.md#testing)

.github/prlint.json

-{
-  "title": [
-    {
-      "pattern": "^(build|ci|docs|feat|fix|perf|refactor|style|test|chore|other)((.+))?:\\s.+",
-      "message": "Your title needs to be prefixed with a topic."
-    }
-  ],
-  "body": [
-    {
-      "pattern": ".{1,}",
-      "message": "You need literally some contents in your description"
-    }
-  ]
-}

.github/titleLint.yml

+regex: (build|ci|docs|feat|fix|perf|refactor|style|test|chore|other): .*