[Request] Create templates for new rule requests

[terrancedejesus]

Summary

The following templates would be useful for community members whom may want to request additional rules.

• Behavior - Add a new endpoint rule

## Description
<!-- Provide a detailed description of the activity to be detected -->

### Additional requirements
<!-- sysmon, beats config modification, etc. -->

### Target Operating Systems
<!-- windows, linux, macOS, etc -->

## Optional Info

### Query

### Related issues or PRs

### References

## Example Data
<!-- Example JSON data from the actual detonated activity makes this process much quicker -->

• YARA - Add a new YARA rule

## Description
<!-- Provide a detailed description of the binary attributes to be detected -->

### Target Operating Systems
<!-- windows, linux, macOS, etc -->

## Optional Info

### YARA signature

### Related issues or PRs

### References

## Example Sample
<!-- Example sample binary makes this process much quicker -->