add issue and pull request templates

add templates with importend information to optimize the support

Author: psychocrypt

.github/ISSUE_TEMPLATE.md

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+Please provide as much as possible information to reproduce the issue.
+
+# Basic information
+  - Type of the CPU.
+  - Type of the GPU (if you try to miner with the GPU).
+
+# Compile issues
+  - Which OS do you use?
+  ```
+  add **all** commands you used and the **full** compile output here
+  ```
+  ```
+  run `cmake -LA .` in the build folder and add the output here
+  ```
+
+# Issue with the execution
+  - Do you compiled the miner by our own?
+  ```
+  run `./xmr-stak --version-long` and add the output here
+  ```
+
+# AMD OpenCl issue
+
+  ```
+  run `clinfo` and add the output here
+  ```
+
+# Stability issue
+  - Is the CPU or GPU overclocked?
+  - Is the Main memory of the CPU or GPU undervolted?

.github/PULL_REQUEST_TEMPLATE.md

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+Please make sure your PR is against **dev** branch. Merging PRs directly into master branch would interfere with our workflow.