Add README with install instructions.

README.md

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+# [tensorflow.rstudio.com](https://tensorflow.rstudio.com) sources
+
+Here you can find the source code for the website https://tensorflow.rstudio.com (also https://keras.rstudio.com, which redirects to https://tensorflow.rstudio.com).
+
+Contributions are welcome!
+If you would like to propose changes to the website:
+
+1.  Fork and clone this repository
+2.  Run or `source()` the R script \_utils/create-r-tensorflow-website-venv.R.
+
+``` bash
+Rscript _utils/create-r-tensorflow-website-venv.R
+```
+
+3.  Install [quarto](https://quarto.org/docs/get-started/).
+4.  At the terminal, run `quarto preview` . The first time you run this it will take up to 10 minutes to create a new folder in the project: "\_site". This is a local build of the website you will be able to work with interactively. Once quarto is done rendering the local site, you it will open a browser where you can preview your changes live.
+5.  Modify the files you are interested in changing using your editor of choice (e.g., RStudio). `quarto preview` will automatically execute and rerender the updated qmds and you will see your changes reflected in the live preview in the browser.
+6.  Once you're happy with your changes, push them to your forked repo and open a pull request.
+
+If you run into any difficulties with the instructions above, please don't hesitate to file an [issue](https://github.com/rstudio/tensorflow.rstudio.com/issues/new).