#23 - added legal/IP contribution documents

CONTRIBUTING_IO.md

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+
+## Legal
+
+Consistent with Section D.6. of the GitHub Terms of Service as of 2019, and Section 5. of the Apache License, Version 2.0, the project maintainer for this project accepts contributions using the inbound=outbound model.
+When you submit a pull request to this repository (inbound), you are agreeing to license your contribution under the same terms as specified in [LICENSE] (outbound).
+
+This is an open source project.
+Contributions you make to this public U.S. Government ("USG") repository are completely voluntary.
+When you submit an issue, bug report, question, enhancement, pull request, etc., you are offering your contribution without expectation of payment, you expressly waive any future pay claims against the USG related to your contribution, and you acknowledge that this does not create an obligation on the part of the USG of any kind.
+Furthermore, your contributing to this project does not create an employer-employee relationship between the United States ("U.S.") Government and the contributor.
+
+[LICENSE]: LICENSE.txt

DISCLAIMER.md

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+# Disclaimer of Warranty
+
+This Work is provided "AS IS."
+Any express or implied warranties, including but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed.
+In no event shall the United States Government be liable for any direct, indirect, incidental, special, exemplary or consequential damages (including, but not limited to, procurement of substitute goods or services, loss of use, data or profits, or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this Work, even if advised of the possibility of such damage.
+
+The User of this Work agrees to hold harmless and indemnify the United States Government, its agents and employees from every claim or liability (whether in tort or in contract), including attorney's fees, court costs, and expenses, arising in direct consequence of Recipient's use of the item, including, but not limited to, claims or liabilities made for injury to or death of personnel of User or third parties, damage to or destruction of property of User or third parties, and infringement or other violations of intellectual property or technical data rights.
+
+# Disclaimer of Endorsement
+
+Nothing in this Work is intended to constitute an endorsement, explicit or implied, by the United States Government of any particular manufacturer's product or service.
+
+Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, in this Work does not constitute an endorsement, recommendation, or favoring by the United States Government and shall not be used for advertising or product endorsement purposes.

INTENT.md

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+## Licensing Intent
+
+The intent is that this software and documentation ("Project") should be treated
+as if it is licensed under the license associated with the Project ("License")
+in the LICENSE file. However, because we are part of the United States (U.S.)
+Federal Government, it is not that simple.
+
+The portions of this Project written by U.S. Federal Government employees within
+the scope of their federal employment are ineligible for copyright protection in
+the U.S.; this is generally understood to mean that these portions of the
+Project are placed in the public domain.
+
+In countries where copyright protection is available (which does not include the
+U.S.), contributions made by U.S. Federal Government employees are released
+under the License. Merged contributions from private contributors are released
+under the License.
+
+The SkillTree software is released under the Apache License, Version 2.0
+("Apache 2.0").