add README, test.properties files (#2538)

* add README, test.properties files

* fix for minor issues

* add describtion, change the layout

* fix for the minor issues in readme

external/jacoco/README.md

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+## External Jacoco Tests
+
+Jacoco tests are part of the external third-party application tests that help verify that the Adoptium binaries are good, by running a variety of Java applications inside of Docker containers. AdoptOpenJDK/openjdk-tests/Issue #172 lists the applications that we have initially targeted to best exercise the AdoptOpenJDK binaries. For each application, we choose to run a selection of their functional tests.
+Jacoco test material is pulled from the [Jacoco repository](https://github.com/jacoco/jacoco).
+
+## Running External Jacoco tests locally
+To run any AQA tests locally, you follow the same pattern:
+
+0. Ensure your test machine is set up with [test prereqs](https://github.com/AdoptOpenJDK/openjdk-tests/blob/master/doc/Prerequisites.md). For external tests, you do need Docker installed.
+1. Download/unpack the SDK that you want to test to your test machine
+1. `export TEST_JDK_HOME=</pathToWhereYouInstalledSDK>`
+1. `git clone https://github.com/AdoptOpenJDK/openjdk-tests.git`
+1. `cd openjdk-tests`
+1. `./get.sh`
+1. `cd TKG`
+1. export required environment variables, BUILD_LIST and EXTRA_DOCKER_ARGS (`export BUILD_LIST=external/jacoco> and <export EXTRA_DOCKER_ARGS="-v $TEST_JDK_HOME:/opt/java/openjdk"`)
+1. `make compile` (This fetches test material and compiles it, based on build.xml files in the test directories)
+1.`make _jacoco_test` (When you defined BUILD_LIST to point to a directory in openjdk-tests/external, then this is a testCaseName from the playlist.xml file within the directory you chose).
+
+When [running these from the command-line](https://github.com/AdoptOpenJDK/openjdk-tests/blob/master/doc/userGuide.md#local-testing-via-make-targets-on-the-commandline), these tests are grouped under a make target called 'external', so 'make external' would run the entire set of tests found in the openjdk-tests/external directory. This is unadvisable! Limit what you compile and run, BUILD_LIST=external/`<someSubDirectory>`, and TARGET=`<testCaseNameFromSubdirPlaylist>`
+
+These tests run regularly and results can be found in [TRSS Third Party Application view](https://trss.adoptopenjdk.net/ThirdPartyAppView).

external/jacoco/test.properties

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+github_url="https://github.com/jacoco/jacoco.git"
+script="jacoco-test.sh"
+test_results="testResults"
+tag_version="master"
+environment_variable="MODE=\"java\""
+debian_packages="git maven"
+debianslim_packages="${debian_packages}"
+ubuntu_packages="${debian_packages}"
+alpine_packages="git maven"
+centos_packages="git maven"
+clefos_packages="${centos_packages}"
+ubi_packages="git maven"
+ubi_minimal_packages="${ubi_packages}"