doc: zephyr: add TI specific readme

Update top-level readme to be specific to Texas Instruments

Signed-off-by: Vebjorn Myklebust <[email protected]>

README.md

@@ -0,0 +1,119 @@
+# Texas Instruments Support for Zephyr
+
+<p align="center">
+  <img src="doc/images/ti_logo.png" />
+</p>
+
+The Texas Instruments Zephyr GitHub repository is the starting point for Zephyr
+development on supported Texas Instruments devices. TI's Zephyr solution is
+based on the Zephyr project and utilizes the same familiar environment, tools,
+and dependencies.
+
+## What is Zephyr?
+
+The Zephyr Project is a scalable real-time operating system (RTOS) supporting
+multiple hardware architectures, optimized for resource constrained devices,
+and built with security in mind.
+
+The Zephyr OS is based on a small-footprint kernel designed for use on
+resource-constrained systems: from simple embedded environmental sensors and
+LED wearables to sophisticated smart watches and IoT wireless gateways.
+
+This release of TI Zephyr is based on v3.6.0 and includes support for the following
+Texas Instruments boards and devices. This release specifically adds support for
+CC2340R5 and the LP_EM_CC2340R5 Launchpad.
+
+#### Devices
+
+- CC1352P
+- CC1352R
+- CC2652P
+- CC2652R
+- CC1352P7
+- CC1352R7
+- CC2652P7
+- CC2652R7
+- CC3220SF
+- CC3235SF
+- CC2340R5
+
+#### Boards
+
+- cc1352p1_launchxl
+- cc1352p7_launchpad
+- cc1352r1_launchxl
+- cc26x2r1_launchxl
+- cc3220sf_launchxl
+- cc3235sf_launchxl
+- lp_em_cc2340r5
+
+## Getting Started
+
+For getting started, please refer to the [Upstream Zephyr Readme](https://github.com/zephyrproject-rtos/zephyr/blob/main/README.rst)
+for the Zephyr project and follow the same getting-started guide for setting up
+the environment and building your first application.
+
+> **_NOTE:_** When running `west init` in the getting-started guide it's
+> important to instead run `west init -m https://github.com/TexasInstruments/simplelink-zephyr -mr v3.6.0-d0ae1a8b105-ti-8.20.00_ea zephyrproject`
+> in order to use the TI Zephyr repository.
+
+## Tools support
+
+Currently the XDS110 debugger supplied with TI Launchpads is not natively
+supported in the `west` Zephyr tool for all devices. In order to flash/debug the
+CC2340R5 device with `west`, only [JLink](https://www.segger.com/downloads/jlink/)
+is available. The recommended version to use is V7.94f which has been used for
+validation. Note that it is also possible to build an application in Zephyr
+targeting CC2340R5, and to use [Code Composer Studio](https://www.ti.com/tool/CCSTUDIO)
+to both flash and debug the application using the XDS110 debugger.
+
+## Versioning
+
+TI will tag each release with the following format: {upstream-tag}-ti-M.mm.pp(\_optional-qualifier)
+
+This tag can be broken down into 4 components:
+
+- upstream-tag: This is the tag or commit of the [Zephyr](https://github.com/zephyrproject-rtos/zephyr)
+  repo that the TI release is based on
+- -ti-: Separator
+- TI release version: This is TI's version on top of the upstream Zephyr
+  version. The version scheme is explained below.
+- Qualifier. The qualifier keyword is described below.
+
+### TI Versioning Scheme
+
+The TI version follows a version format, M.mm.pp, where:
+
+- M is a 1 digit major number,
+- mm is a 2 digit minor number,
+- pp is a 2 digit patch number.
+
+M.mm will follow TI's SimpleLink SDK version and is an indicator that the TI
+added content is based on the SimpleLink SDK with matching M.mm.
+
+### Qualifier
+
+Tags that are appended with \_ea are for demo only and are beta quality, while
+tags without the \_ea keyword should be treated as production worthy releases.
+
+## Releases
+
+All releases will be tagged using the version format above. Release notes are
+provided in the form of GitHub's release notices. Read the release notes for
+your selected version here:
+
+https://github.com/TexasInstruments/simplelink-zephyr/releases/
+
+#### Disclaimer
+
+This release is provided as-is and should be considered Beta quality. This
+product is meant for demonstration purposes only.
+
+## Need help?
+
+- For technical support with TI Zephyr, including bugs and feature requests -
+  submit a ticket to [TI's Wireless Connectivity E2E forum](https://e2e.ti.com/support/wireless-connectivity/)
+  > **_NOTE:_** Please do not use the Github issue tracker for this project.
+
+Additionally, we welcome any feedback that you can give to improve the
+documentation!