Update issue templates

Adding GitHub issue templates for bugs and enhancements.

Author: kwwall

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Specify what ESAPI version(s) you are experiencing this bug in*
+This is especially important if it is not the latest version of ESAPI.
+
+**To Reproduce**
+List the steps to reproduce the behavior or (ideally) attach a small JUnit test to reproduce the problem. Please _be specific_.
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+[**NOTE:** Please do NOT just ask general questions here as they will _not_ be answered. Instead, please use the GitHub Discussions and create a new topic under 'Questions and Answers".
+Please delete any irrelevant portion of this template before submitting your GitHub issue. Thanks.]
+
+**Platform environment (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - JDK version used with ESAPI
+
+**Additional context**
+Add any other context about the problem here.
+If known, please select the label corresponding to the affected ESAPI component.

.github/ISSUE_TEMPLATE/enhancement-request.md

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+---
+name: Enhancement request
+about: Suggest an enhancment for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+[**NOTE:** Please do NOT just ask general questions here as they will _not_ be answered. Instead, please use the GitHub Discussions and create a new topic under 'Questions and Answers".
+Please delete any irrelevant portion of this template before submitting your GitHub issue. Thanks.]
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen. Note that this may include some appropriate type of documentation that is lacking or unclear.
+
+**Describe alternatives you've considered including other security libraries**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.