Create PULL_REQUEST_TEMPLATE.md

Author: etr

PULL_REQUEST_TEMPLATE.md

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+Hello there! Welcome. Please follow the steps below to tell us about your contribution.
+
+1. Copy the correct template for your contribution
+  - Are you fixing a bug? Copy the template from https://raw.githubusercontent.com/etr/libhttpserver/master/.github/PULL_REQUEST_TEMPLATE/bug_fix.md
+  - Are you improving performance? Copy the template https://raw.githubusercontent.com/etr/libhttpserver/master/.github/PULL_REQUEST_TEMPLATE/performance_improvement.md
+  - Are you updating documentation? Copy the template from https://raw.githubusercontent.com/etr/libhttpserver/master/.github/PULL_REQUEST_TEMPLATE/documentation.md
+  - Are you changing functionality? Copy the template from https://raw.githubusercontent.com/etr/libhttpserver/master/.github/PULL_REQUEST_TEMPLATE/feature_change.md
+2. Replace this text with the contents of the template
+3. Fill in all sections of the template
+4. Click "Create pull request"