[ACA-1281] templates for new issue/pr (#282)

* templates for new issue/pr

* update brower list

.github/ISSUE_TEMPLATE.md

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+<!--
+PLEASE HELP US PROCESS GITHUB ISSUES FASTER BY PROVIDING THE FOLLOWING INFORMATION.
+
+ISSUES MISSING IMPORTANT INFORMATION MAY BE CLOSED WITHOUT INVESTIGATION.
+-->
+
+## I'm submitting a...
+<!-- Check one of the following options with "x" -->
+<pre><code>
+[ ] Regression (a behavior that used to work and stopped working in a new release)
+[ ] Bug report  <!-- Please search GitHub for a similar issue or PR before submitting -->
+[ ] Feature request
+[ ] Documentation issue or request
+[ ] Support request => Please do not submit support request here, instead see https://github.com/Alfresco/alfresco-content-app/blob/master/CONTRIBUTING.md#question
+</code></pre>
+
+## Current behavior
+<!-- Describe how the issue manifests. -->
+
+
+## Expected behavior
+<!-- Describe what the desired behavior would be. -->
+
+
+## Minimal reproduction of the problem with instructions
+<!--
+For bug reports please provide the *STEPS TO REPRODUCE* and if possible a *MINIMAL DEMO* of the problem.
+-->
+
+## What is the motivation / use case for changing the behavior?
+<!-- Describe the motivation or the concrete use case. -->
+
+
+## Environment
+
+<pre><code>
+ACA version: X.Y.Z
+<!-- Check whether this is still an issue in the most recent ACA version -->
+
+Browser:
+- [ ] Chrome version XX
+- [ ] Firefox version XX
+- [ ] Safari version XX
+- [ ] Edge version XX
+- [ ] IE11
+ 
+For Tooling issues:
+- Node version: XX  <!-- run `node --version` -->
+- Platform:  <!-- Mac, Linux, Windows -->
+
+Others:
+<!-- Anything else relevant?  Operating system version, IDE, package manager, HTTP server, ... -->
+</code></pre>

.github/PULL_REQUEST_TEMPLATE.md

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+## PR Checklist
+Please check if your PR fulfills the following requirements:
+
+- [ ] The commit message follows our guidelines: https://github.com/Alfresco/alfresco-content-app/blob/master/CONTRIBUTING.md#commit
+- [ ] Tests for the changes have been added (for bug fixes / features)
+- [ ] Docs have been added / updated (for bug fixes / features)
+
+
+## PR Type
+What kind of change does this PR introduce?
+
+<!-- Please check the one that applies to this PR using "x". -->
+```
+[ ] Bugfix
+[ ] Feature
+[ ] Code style update (formatting, local variables)
+[ ] Refactoring (no functional changes, no api changes)
+[ ] Build related changes
+[ ] CI related changes
+[ ] Documentation content changes
+[ ] Application / Infrastructure changes
+[ ] Other... Please describe:
+```
+
+## What is the current behavior?
+<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
+
+Issue Number: N/A
+
+
+## What is the new behavior?
+
+
+## Does this PR introduce a breaking change?
+```
+[ ] Yes
+[ ] No
+```
+
+<!-- If this PR contains a breaking change, please describe the impact and migration path for existing applications below. -->
+
+
+## Other information