Publish Dockerfiles and test-runner binaries for running language tests.

By following the directions in the README file, these Dockerfiles can be
built and used to run native language tests for their respective runtimes.

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+# Runtimes Tests Dockerfiles
+
+The Dockerfiles defined under this path are configured to host the execution of
+the runtimes language tests. Each Dockerfile can support the language indicated
+by its directory.
+
+The following runtimes are currently supported:
+
+-   Go 1.12
+-   Java 11
+-   Node.js 12
+-   PHP 7.3
+-   Python 3.7
+
+#### Prerequisites:
+
+1) [Install and configure Docker](https://docs.docker.com/install/)
+
+2) Build each Docker container:
+
+```bash
+$ docker build -f $LANG/Dockerfile [-t $NAME] .
+```
+
+### Testing:
+
+If the prerequisites have been fulfilled, you can run the tests with the
+following command:
+
+```bash
+$ docker run --rm -it $NAME [FLAG]
+```
+
+Running the command with no flags will cause all the available tests to execute.
+
+Flags can be added for additional functionality:
+
+-   --list: Print a list of all available tests
+-   --test <name>: Run a single test from the list of available tests
+-   --v: Print the language version