Added PULL_REQUEST_TEMPLATE.md

Change-Id: Iad9c09434f87219e384b294d6221f4cac7a839eb

.github/ISSUE_TEMPLATE.md

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+Thank you for submitting an issue!
+
+Please make sure you include the names of the affected language(s), compiler version(s), operating system version(s), and FlatBuffers version(s) in your issue title.
+
+This helps us get the correct maintainers to look at your issue. Here are examples of good titles:
+
+- Crash when accessing FlatBuffer [C++, gcc 4.8, OS X, master]
+- Flatc converts a protobuf 'bytes' field to 'string' in fbs schema file [all languages, FlatBuffers 1.4]
+
+Include other details as appropriate.
+
+Thanks!

.github/PULL_REQUEST_TEMPLATE.md

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+Thank you for submitting a PR!
+
+Please make sure you include the names of the affected language(s) in your PR title.
+This helps us get the correct maintainers to look at your issue.
+
+If you make changes to any of the code generators, be sure to run
+`cd tests && sh generate_code.sh` (or equivalent .bat) and include the generated
+code changes in the PR. This allows us to better see the effect of the PR.
+
+If your PR includes C++ code, please adhere to the Google C++ Style Guide,
+and don't forget we try to support older compilers (e.g. VS2010, GCC 4.6.3),
+so only some C++11 support is available.
+
+Include other details as appropriate.
+
+Thanks!