Update CLA template for external contributors

Author: Jacob Hageman

.github/pull_request_template.md

@@ -1,27 +1,34 @@
 **Describe the contribution**
-A clear and concise description of what the contribution is [e.g. Fixes issue #X]
+A clear and concise description of what the contribution is.
+- Include explicitly what issue it addresses [e.g. Fixes #X]
 
 **Testing performed**
 Steps taken to test the contribution:
 1. Build steps '...'
-2. Execution steps '....'
+1. Execution steps '...'
 
 **Expected behavior changes**
 A clear and concise description of how this contribution will change behavior and level of impact.
  - API Change: xxx (if applicable)
  - Behavior Change: xxx (if applicable)
  - Or no impact to behavior
 
-**System(s) tested on:**
- - Hardware
- - OS: [e.g. Linux 4.4]
- - Versions [e.g. cFE 6.6, OSAL 4.2, PSP 1.3 for mcp750, any related apps]
+**System(s) tested on**
+ - Hardware: [e.g. PC, SP0, MCP750]
+ - OS: [e.g. Ubuntu 18.04, RTEMS 4.11, VxWorks 6.9]
+ - Versions: [e.g. cFE 6.6, OSAL 4.2, PSP 1.3 for mcp750, any related apps or tools]
 
 **Additional context**
 Add any other context about the contribution here.
 
-**Contributor Info**
-Full name and company/organization of all contributors (required for acceptance)
+**Third party code**
+If included, identify any third party code and provide text file of license
 
-**Community contributors**
-You must attach a signed CLA (required for acceptance) or reference one already submitted
+**Contributor Info - All information REQUIRED for consideration of pull request**
+Full name and company/organization/center of all contributors ("Personal" if individual work)
+- If NASA Civil Servant Employee or GSFC Contractor on SES II
+  - Address/email/phone and contract/task information (if applicable) must be on file
+- Else if Company
+  - **HAND SIGNED** Company CLA must be on file (once per release): [Company CLA](../docs/GSC_18128_Corp_CLA_form_1219.pdf)
+- Else if Individual
+  - **HAND SIGNED** Individual CLA must be on file (once per release): [Individual CLA](../docs/GSC_18128_Ind_CLA_form_1219.pdf)