PR guide line added

.github/CONTRIBUTING.md

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+Thank you for contributing!
+=========================================
+
+Please follow issue/PR template.

.github/ISSUE_TEMPLATE.md

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+### Package: <name>
+
+For existing package:
+
+- expected behavior: ...
+- actual behavior: ...
+
+
+For new package to be added:
+
+- make sure there's no similar package already added,
+- describe killer features of new package,
+- make sure it's open source and not abandoned (at least for last 5 years or so),
+- please, use native compilation for additional PHP, Perl, Ruby, Python modules for non-MIPS platforms.
+
+
+### Platform:
+
+- please, tell us what feed and\or devices are you using.
+- be ready to check issue-related  changes or it will be closed after 30 days with "no response" status.

.github/PULL_REQUEST_TEMPLATE.md

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+Please double check that your PR is for Buildroot or existing packages in /package folder only.
+
+Please, add new packages to appropriate feeds:
+- [rtndev](https://github.com/Entware-for-kernel-3x/rtndev-3x) for packages which was never existed in OpenWrt before.
+- [go](https://github.com/Entware-for-kernel-3x/entware-go-3x) for packages, written in Golang.
+- [oldports](https://github.com/Entware-for-kernel-3x/entware-oldpackages-ports-3x) for packages which is abandoned form OpenWrt for some reason.
+- [packages](https://github.com/Entware-for-kernel-3x/entware-packages-3x), [routing](https://github.com/Entware-for-kernel-3x/entware-routing-3x), [telephony](https://github.com/Entware-for-kernel-3x/entware-telephony-3x) for packages, maintained by OpenWrt team.
+
+Thanks for your contribution
+Please remove this text (before ---) and fill the following template
+-------------------------------
+
+Compile tested: (put here arch, model, version)
+Run tested: (put here arch, model, version, tests done)