chore(docs): Added contribution templates, SECURITY policy

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug encountered while using ERPNext
+labels: bug
+---
+
+<!--
+Welcome to ERPNext issue tracker! Before creating an issue, please heed the following:
+
+1. This tracker should only be used to report bugs and request features / enhancements to ERPNext
+    - For questions and general support, checkout the manual https://erpnext.com/docs/user/manual/en or use https://discuss.erpnext.com
+    - For documentation issues, refer to https://github.com/frappe/erpnext_com
+2. Use the search function before creating a new issue. Duplicates will be closed and directed to
+   the original discussion.
+3. When making a bug report, make sure you provide all required information. The easier it is for
+   maintainers to reproduce, the faster it'll be fixed.
+4. If you think you know what the reason for the bug is, share it with us. Maybe put in a PR 😉
+-->
+
+## Description of the issue
+
+## Context information (for bug reports)
+
+**Output of `bench version`**
+```
+(paste here)
+```
+
+## Steps to reproduce the issue
+
+1.
+2.
+3.
+
+### Observed result
+
+### Expected result
+
+### Stacktrace / full error message
+
+```
+(paste here)
+```
+
+## Additional information
+
+OS version / distribution, `ERPNext` install method, etc.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea to improve ERPNext
+labels: feature-request
+---
+
+<!--
+Welcome to ERPNext issue tracker! Before creating an issue, please heed the following:
+
+1. This tracker should only be used to report bugs and request features / enhancements to ERPNext
+    - For questions and general support, checkout the manual https://erpnext.com/docs/user/manual/en or use https://discuss.erpnext.com
+    - For documentation issues, refer to https://github.com/frappe/erpnext_com
+2. Use the search function before creating a new issue. Duplicates will be closed and directed to
+   the original discussion.
+3. When making a feature request, make sure to be as verbose as possible. The better you convey your message, the     greater the drive to make it happen.
+-->
+
+**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.
+
+**Describe alternatives you've considered**
+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.

.github/ISSUE_TEMPLATE/question-about-using-erpnext.md

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+---
+name: Question about using ERPNext
+about: This is not the appropriate channel
+labels: invalid
+---
+
+Please post on our forums:
+
+for questions about using `ERPNext`: https://discuss.erpnext.com
+
+for questions about using the `Frappe Framework`: https://discuss.frappe.io
+
+for questions about using `bench`, probably the best place to start is the [bench repo](https://github.com/frappe/bench)
+
+For documentation issues, use the [ERPNext Documentation](https://erpnext.com/docs/) or [Frappe Framework Documentation](https://frappe.io/docs/user/en) or the [developer cheetsheet](https://github.com/frappe/frappe/wiki/Developer-Cheatsheet)
+
+> **Posts that are not bug reports or feature requests will not be addressed on this issue tracker.**

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,2 +1,33 @@
-Please read the pull request checklist to make sure your changes are merged: https://github.com/frappe/erpnext/wiki/Pull-Request-Checklist
+<!--
 
+Some key notes before you open a PR:
+
+ 1. Select which branch should this PR be merged in?
+ 2. PR name follows [convention](http://karma-runner.github.io/4.0/dev/git-commit-msg.html)
+ 3. All tests pass locally, UI and Unit tests
+ 4. All business logic and validations must be on the server-side
+ 5. Update necessary Documentation
+ 6. Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes
+
+
+Also, if you're new here
+
+- Documentation Guidelines => https://github.com/frappe/erpnext/wiki/Updating-Documentation
+
+- Contribution Guide => https://github.com/frappe/frappe/blob/develop/.github/CONTRIBUTING.md
+
+- Pull Request Checklist => https://github.com/frappe/erpnext/wiki/Pull-Request-Checklist
+
+-->
+
+> Please provide enough information so that others can review your pull request:
+
+<!-- You can skip this if you're fixing a typo or updating existing documentation -->
+
+> Explain the **details** for making this change. What existing problem does the pull request solve?
+
+<!-- Example: When "Adding a function to do X", explain why it is necessary to have a way to do X. -->
+
+> Screenshots/GIFs
+
+<!-- Add images/recordings to better visualize the change: expected/current behviour -->

SECURITY.md

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+# Security Policy
+
+The ERPNext team and community take security issues seriously. To report a security issue, fill out the form at [https://erpnext.com/security/report](https://erpnext.com/security/report).
+
+You can help us make ERPNext and all it's users more secure by following the [Reporting guidelines](https://erpnext.com/security).
+
+We appreciate your efforts to responsibly disclose your findings. We'll endeavor to respond quickly, and will keep you updated throughout the process.