Update issue template for product submission

.github/ISSUE_TEMPLATE/software-product-submission-template.md

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+---
+name: Software Product Submission Template
+about: Schema for product submission for log4j vulnerability.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+# Status Descriptions
+
+|Status| Description |
+|------|-------------|
+| Unknown | Status unknown.  Default choice. |
+| Affected| Reported to be affected by CVE-2021-44228. |
+| Not Affected | Reported to NOT be affected by CVE-2021-44228 and no further action necessary. |
+| Fixed | Patch and/or mitigations available (see provided links).  |
+| Under Investigation | Vendor investigating status. |
+
+# Software List
+
+| Vendor        | Product         | Version         | Status          | Update Available | Notes | References |  Last Updated |
+|:--------------|:----------------|:---------------:|:---------------:|:-----------------|-----------------------|:-------|--------------:|
+| Vendor-name | Product-Name      | Version Number(s)          | Unknown/Affected/Not Affected/Fixed/Under Investigation | Yes/No [Link if Yes]()  | <Statement by vendor, vuln note, etc.>| [Link Here]() | Date of Last Update |