Initial readme and contributing docs (open-telemetry#3)

Author: reyang

CONTRIBUTING.md

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+# Contributing to opentelemetry-cpp
+
+The OpenTelemetry C/C++ special interest group (SIG) meets regularly. See the
+OpenTelemetry [community](https://github.com/open-telemetry/community#cc-sdk)
+repo for information on this and other language SIGs.
+
+See the [public meeting notes](https://docs.google.com/document/d/1i1E4-_y4uJ083lCutKGDhkpi3n4_e774SBLi9hPLocw/edit)
+for a summary description of past meetings. To request edit access, join the
+meeting or get in touch on [Gitter](https://gitter.im/open-telemetry/opentelemetry-cpp).
+
+See the [community membership document](https://github.com/open-telemetry/community/blob/master/community-membership.md)
+on how to become a [**Member**](https://github.com/open-telemetry/community/blob/master/community-membership.md#member),
+[**Approver**](https://github.com/open-telemetry/community/blob/master/community-membership.md#approver)
+and [**Maintainer**](https://github.com/open-telemetry/community/blob/master/community-membership.md#maintainer).
+
+## Development
+
+TBD
+
+## Pull Requests
+
+### How to Send Pull Requests
+
+Everyone is welcome to contribute code to `opentelemetry-cpp` via GitHub pull
+requests (PRs).
+
+To create a new PR, fork the project in GitHub and clone the upstream repo:
+
+```sh
+$ git clone https://github.com/open-telemetry/opentelemetry-cpp.git
+```
+
+Add your fork as an origin:
+
+```sh
+$ git remote add fork https://github.com/YOUR_GITHUB_USERNAME/opentelemetry-cpp.git
+```
+
+Build:
+
+TBD
+
+Test:
+
+TBD
+
+Check out a new branch, make modifications and push the branch to your fork:
+
+```sh
+$ git checkout -b feature
+# edit files
+$ git commit
+$ git push fork feature
+```
+
+Open a pull request against the main `opentelemetry-cpp` repo.
+
+### How to Receive Comments
+
+* If the PR is not ready for review, please put `[WIP]` in the title, tag it
+  as `work-in-progress`, or mark it as [`draft`](https://github.blog/2019-02-14-introducing-draft-pull-requests/).
+* Make sure [CLA](https://identity.linuxfoundation.org/projects/cncf) is signed and CI is clear.
+
+### How to Get PRs Merged
+
+A PR is considered to be **ready to merge** when:
+* It has received two approvals from [Approvers](https://github.com/open-telemetry/community/blob/master/community-membership.md#approver)
+  / [Maintainers](https://github.com/open-telemetry/community/blob/master/community-membership.md#maintainer)
+  (at different companies).
+* Major feedback items/points are resolved.
+* It has been open for review for at least one working day. This gives people
+  reasonable time to review.
+* Trivial changes (typo, cosmetic, doc, etc.) don't have to wait for one day.
+* Urgent fixes can take exceptions as long as it has been actively communicated.
+
+Any Approver / Maintainer can merge the PR once it is **ready to merge**.
+
+## Style Guide
+
+TBD

README.md

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+# OpenTelemetry C/C++
+[![Gitter chat][gitter-image]][gitter-url]
+
+[gitter-image]: https://badges.gitter.im/open-telemetry/opentelemetry-cpp.svg
+[gitter-url]: https://gitter.im/open-telemetry/opentelemetry-cpp?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
+
+The C/C++ [OpenTelemetry](https://opentelemetry.io/) client.
+
+## Installation
+
+TBD
+
+## Quick Start
+
+TBD
+
+## Contributing
+
+See [CONTRIBUTING.md](CONTRIBUTING.md)
+
+## Release Schedule
+
+OpenTelemetry C/C++ is under active development.
+
+The library is not yet _generally available_, and releases aren't guaranteed to
+conform to a specific version of the specification.  Future releases will not
+attempt to maintain backwards compatibility with current releases.