[GIT] Add CODEOWNERS and PR Template (#102)

Signed-off-by: nileshnegi <Nilesh.Negi@amd.com>

[ROCm/rccl-tests commit: 448c4c7269]

projects/rccl-tests/.github/CODEOWNERS

@@ -0,0 +1,6 @@
+* @wenkaidu @gilbertlee-amd @akolliasAMD @edgargabriel @PedramAlizadeh @nusislam @nileshnegi @KawtharShafie @AtlantaPepsi @mberenjk @corey-derochie-amd @mustafabar @thananon @JhaShweta1 @haripriya-amd
+
+# Documentation files
+doc/ @ROCm/rocm-documentation
+*.md @ROCm/rocm-documentation
+*.rst @ROCm/rocm-documentation

projects/rccl-tests/.github/PULL_REQUEST_TEMPLATE.md

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+## Details
+___Do not mention proprietary info or link to internal work items in this PR.___
+
+**Work item:** _"Internal", or link to GitHub issue (if applicable)._
+
+**What were the changes?**  
+_One sentence describing the work done._
+
+**Why were the changes made?**  
+_Explain the motivation behind the work. Provide any publicly-available historical context._
+
+**How was the outcome achieved?**  
+_Technical details behind the work. Explain any publicly-available hardware peculiarities._
+
+**Additional Documentation:**  
+_What else should the reviewer know?_