feat: new issue template for mismatch information (#4283)

* feat: new issue template for mismatch information

Signed-off-by: Meet Soni <meetsoni3017@gmail.com>

.github/ISSUE_TEMPLATE/mismatch-report.md

@@ -0,0 +1,27 @@
+---
+name: 'Report a false positive or incorrect component (mismatch)'
+about: Template for reporting false positive
+title: 'bug: incorrect detection for [product name]'
+labels: bug
+assignees: ''
+
+---
+
+### Description
+
+Add a short description of the invalid vendor-product relation.
+
+```yml
+  purls:
+    - [purl identifier] (e.g. pkg:pypi/zstandard.  This will be in the format pkg:[package repository]/[product name])
+
+  invalid_vendors:
+    - [list of vendors that shouldn't be detected] (e.g. facebook)
+```
+
+Not sure how to fill this out? Give us the CVE number that's being incorrectly detected and we'll try to figure it out from there.
+
+### Instructions
+
+[How to add a new entry to the mismatch database](https://github.com/intel/cve-bin-tool/blob/main/doc/mismatch_data.md)
+