Clarify open source nature of project (#101)

.github/issue_template.md

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+
+
+## Before you submit this issue
+This is a **public, open source project**. Confidential or sensitive information should not be included in this description or any comments, including but not limited to links, files, and documents.
+
+*If you're not certain that information is not confidential or sensitive in nature, do not include it.*
+
+- [ ] I have verified that this issue does not include any confidential information

.github/pull_request_template.md

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+# Summary of PR
+<!-- Write a brief summary of what this PR achieves and if it is large, please outline the most important things to review -->
+
+## Before you submit this PR
+This is a **public, open source project**. Confidential or sensitive information should not be included in this description or any comments, including but not limited to links, files, and documents.
+
+*If you're not certain that information is not confidential or sensitive in nature, do not include it.*
+
+- [ ] I have verified that this PR does not include any confidential information

README.md

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+# Macro Open Source Project: LOK
+
+This is a public project that forks LibreOffice to provide functionality and fixes that don't fit in [the upstream project](https://github.com/LibreOffice/core).
+
+This repository is open sourced under the [Mozilla Public License 2.0](LICENSE).
+
+This project is not a part of the official LibreOffice project, nor endorsed by the Document Foundation.
+
 # Prerequisites
 
 ## Windows