Added all documentation.

Signed-off-by: Owen Thompson <[email protected]>

CHANGES.md

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+# Imath Release Notes
+
+## Inherited History from OpenEXR
+History dated before May 9th 2020 has been inherited from OpenEXR
+This history has been filtered using the tool [git-filter-repo](https://github.com/newren/git-filter-repo)
+
+This tool can selectively remove unneeded history based on the directories to which commits have been made. For instance, it can remove all history from a given directory using the command:\
+
+git filter-repo --path old_dir1/ --path old_dir2/ --invert-paths\
+
+Or it can keep all history from certain paths using \
+
+git filter-repo --path remaining_dir1/ --path remaining_dir2/
+

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+The Imath project abides by Linux Foundation's code of conduct,
+which you can read in full
+[here](https://lfprojects.org/policies/code-of-conduct).
+
+Our covenant includes:
+
+* Treat each other with respect, professionalism, fairness, and
+  sensitivity to our many differences and strengths, including in
+  situations of high pressure and urgency.
+
+* Never harass or bully anyone verbally, physically or sexually.
+
+* Never discriminate on the basis of personal characteristics or group
+  membership.
+
+* Communicate constructively and avoid demeaning or insulting behavior
+  or language.
+
+* Seek, accept, and offer objective work criticism, and acknowledge
+  properly the contributions of others.
+
+* Be honest about your own qualifications, and about any circumstances
+  that might lead to conflicts of interest.
+
+* Respect the privacy of others and the confidentiality of data you
+  access.
+
+* With respect to cultural differences, be conservative in what you do
+  and liberal in what you accept from others, but not to the point of
+  accepting disrespectful, unprofessional or unfair or unwelcome
+  behavior or advances.
+
+* Promote the rules of this Code and take action (especially if you
+  are in a leadership position) to bring the discussion back to a more
+  civil level whenever inappropriate behaviors are observed.
+
+* Stay on topic: Make sure that you are posting to the correct channel
+  and avoid off-topic discussions. Remember when you update an issue
+  or respond to an email you are potentially sending to a large number
+  of people.
+
+* Step down considerately: participants in every project come and go,
+  and LF Projects is no different. When you leave or disengage from
+  the project, in whole or in part, we ask that you do so in a way
+  that minimizes disruption to the project. This means you should tell
+  people you are leaving and take the proper steps to ensure that
+  others can pick up where you left off.
+
+To report incidents or to appeal reports of incidents, send email to
+the Manager of LF Projects at [email protected].