Add PR template

.github/PULL_REQUEST_TEMPLATE/task_submission.md

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+<!--
+Pull request title requirement:
+
+"<LastName> <FirstName>. Technology <TECHNOLOGY_NAME:SEQ|OMP|TBB|STL|MPI>. <Full Task Name>. Variant <Number>"
+-->
+
+## Description
+<!--
+Please provide a detailed description of your implementation, including:
+ - key solution details (chosen algorithm description)
+ - parallelism technology application (if applicable)
+-->
+
+- **Task**: _Enter the full task name here_
+- **Variant**: _Enter the variant number here_
+- **Technology**: _Enter technology (e.g., SEQ, OMP, TBB, STL, MPI)_
+- **Description** of your implementation and report.  
+  _Provide a concise summary of your implementation and report here._
+
+---
+
+## Checklist
+<!--
+Please ensure the following items are completed **before** submitting your pull request and requesting a review:
+-->
+
+- [ ] **CI Status**: All CI jobs (build, tests, report generation) are passing on my branch in my fork
+- [ ] **Task Directory & Naming**: I have created a directory named `<lastName>_<firstInitial>_<short_task_name>`
+- [ ] **Full Task Definition**: I have provided the complete task description in the pull request body.
+- [ ] **clang-format**: My changes pass `clang-format` locally in my fork (no formatting errors)
+- [ ] **clang-tidy**: My changes pass `clang-tidy` locally in my fork (no warnings/errors)
+- [ ] **Functional Tests**: All functional tests are passing locally on my machine
+- [ ] **Performance Tests**: All performance tests are passing locally on my machine
+- [ ] **Branch**: I am working on a branch named exactly as my task directory (e.g., `nesterov_a_vector_sum`), not on `master`.
+- [ ] **Truthful Content**: I confirm that every detail provided in this pull request is accurate and truthful to the best of my knowledge.
+
+<!--
+NOTE: Untruthful entries in this checklist may result in PR rejection and zero points for the associated task.
+-->