[dotnet] Add notes on updating the dependencies

dotnet/README.md

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+# Selenium .Net Bindings
+
+Just as in the rest of the project, we use Bazel as our build system. This means that you can take advantage of a
+hermetic build environment, and know that your build will work on both macOS and Linux, as well as Windows. However,
+this does come at the cost of being a little unusual to work with.
+
+Before opening the VS Studio project, the first thing to do is to build everything you might need using Bazel. To do
+this: `bazel build dotnet/...` This first build may take a while, as it will download a bunch of required files. Make
+sure you've got a good Internet connection too!
+
+## Updating dependencies
+
+We use [paket][] to manage our dependencies. In order to manage them, first `cd` into the `dotnet` directory, and make
+sure you have `paket` installed:
+
+```shell
+dotnet new tool-manifest
+dotnet tool install paket
+dotnet tool restore
+```
+
+This should be a one-time step. Once complete, edit the `//dotnet:paket.dependencies` file to add or update the deps you
+need. Next, from the root of the project (in the directory where the `WORKSPACE` file is),
+run `./dotnet/update-deps.sh`. This should execute successfully and will update both the `paket.lock` and `paket.bzl`
+files. Once this is done, commit the changes, and you'll be able to use the files in your build.
+
+[paket]: https://fsprojects.github.io/Paket/