Updated PR template (NVIDIA#3619)

* Moving categories around

Signed-off-by: szalpal <mszolucha@nvidia.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,19 +1,25 @@
 <!---
-Thank you for contributing to NVIDIA DALI.
+Thank you for contributing to NVIDIA DALI! If you haven't yet,
+please read the contributing guidelines in the CONTRIBUTING.md file.
 
-Please fill the relevant information in this PR template.
+We need a few more information from you to proceed.
+Please fill the relevant sections in this PR template.
 
-Fields with `- [ ]` represent check-boxes that can be marked after you create and save the Pull Request.
+Fields in the Checklist section can be marked after you create and save the Pull Request.
 --->
 
-## Description
-- [ ] **Bug fix** (*non-breaking change which fixes an issue*)
-- [ ] **New feature** (*non-breaking change which adds functionality*)
-- [ ] **Breaking change** (*fix or feature that would cause existing functionality to not work as expected*)
-- [ ] **Refactoring** (*Redesign of existing code that doesn't affect functionality*)
-- [ ] **Other** (*e.g. Documentation, Tests, Configuration*)
 
-### What happened in this PR
+## Category:
+<!--- Please pick one from below: --->
+<!--- **Bug fix** (*non-breaking change which fixes an issue*) --->
+<!--- **New feature** (*non-breaking change which adds functionality*) --->
+<!--- **Breaking change** (*fix or feature that would cause existing functionality to not work as expected*) --->
+<!--- **Refactoring** (*Redesign of existing code that doesn't affect functionality*) --->
+<!--- **Other** (*e.g. Documentation, Tests, Configuration*) --->
+
+
+
+## Description:
 <!---
 Please explain what kind of change is in this PR and why it is submitted.
 Any additional context or description of the solution is welcomed.
@@ -24,13 +30,25 @@ Examples:
 - The *new feature/bugfix* uses *a new data structure/algorithm* to do *X* instead of *Y*.
 --->
 
-#### Additional information
-- Affected modules and functionalities:
+
+
+## Additional information:
+
+### Affected modules and functionalities:
 <!--- Describe here what was changed, added, removed. --->
 
-- Key points relevant for the review:
+
+
+### Key points relevant for the review:
 <!--- Describe here what is the most important part that reviewers should focus on. --->
 
+
+
+<!--- 
+At this point you can hit "Create".
+The checklist below shall be filled in the created PR.
+--->
+
 ## Checklist
 
 ### Tests