doc : templates added #3

.github/ISSUE_TEMPLATE.md

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+#### Description
+
+#### Steps/Code to Reproduce
+
+#### Expected Behavior
+
+#### Actual Behavior
+
+#### Operating System
+
+#### Python Version
+
+#### Samila Version (Use : `samila.__version__`)

.github/PULL_REQUEST_TEMPLATE.md

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+#### Reference Issues/PRs
+
+#### What does this implement/fix? Explain your changes.
+
+
+#### Any other comments?
+