Add contributing guide

Update howto-release.txt
Create ISSUE_TEMPLATE

Bugs: https://github.com/proot-me/PRoot/issues/157

HACKING.rst

@@ -0,0 +1,41 @@
+==============================
+ Contributing to PRoot / CARE
+==============================
+
+-----------------------------------------------------------
+An introduction to contributing to PRoot / CARE development
+-----------------------------------------------------------
+
+The PRoot Team welcomes, and depends, on contributions from students and
+collaborators in the open source and academic communities.
+Contributions can be made in a number of ways, a few examples are:
+
+- Code patches via pull requests
+- Documentation improvements
+- Bug reports and patch reviews
+
+Reporting an Issue
+==================
+
+Please include as much detail as you can. Let us know your host kernel
+version, e.g, :code:`uname -a`, host/guest distribution, e.g. :code:`cat /etc/os-release`,
+and the :code:`PRoot`/:code:`CARE` version number. If you get an error please include the full
+error and/or traceback. Issues are tracked on GitHub at <https://github.com/proot-me/proot/issues>,
+or can also be sent via  the `mailing list <mailto:proot_me@googlegroups.com>`_.
+
+Submitting Pull Requests
+========================
+
+Once you are happy with your changes or you are ready for some feedback, push
+it to your fork and send a pull request. For a change to be accepted it will
+most likely need to have updated tests and/or documentation. New features
+**require** additional tests in order to be included in a future release.
+
+Resources
+=========
+
+- `Contributing to Open Source Projects <http://www.contribution-guide.org>`_
+
+- `How To Ask Questions The Smart Way <http://www.catb.org/esr/faqs/smart-questions.html>`_
+
+- `Indentation Style - Wikipedia <https://en.wikipedia.org/wiki/Indentation_style#K&R_style>`_

ISSUE_TEMPLATE

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+## Expected Behavior
+
+## Actual Behavior
+
+
+## Steps to Reproduce the Problem
+
+  1.
+  2.
+  3.
+
+## Specifications
+
+  - Proot/Care version:
+  - Kernel version:
+  - Host distribution:
+  - Guest distribution:
+
+## Command Output
+
+```terminal
+Inline log
+```
+
+-OR-
+
+[Attached log]()

doc/howto-release.txt

@@ -26,7 +26,7 @@ Checks
 
   where "/usr/bin/true" is a symlink to "/bin/true".
 
-+ Static analysis: Coverity Scan and Clang Scan Build must not report
++ Static analysis: Gcov/Lcov and Clang Scan Build must not report
   new issues.