docs: added readme for testDokka.sh

testDokka.sh.md

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+## Purpose
+`.testDokka.sh` makes Dokka development and testing a bit faster
+
+It compiles current Dokka version from the source code, \
+publishes it to the local Maven repository, \
+then runs the Dokka documentation generation against the specified project \
+and finally runs a webserver to open the generated documentation in the browser.
+
+## Usage
+
+### Without parameters 
+By default it applied to the `./examples/gradle/dokka-gradle-example` project
+
+```bash
+./testDokka.sh
+```
+
+### Specify test project path
+
+```bash
+./testDokka.sh -d './examples/gradle/dokka-gradle-example'
+```
+
+### Specify Dokka version
+
+```bash
+./testDokka.sh -v "1.9.20-SNAPSHOT"
+```
+
+### Specify port
+
+```bash
+./testDokka.sh  -p 8001
+```
+
+### All together
+
+```bash
+./testDokka.sh -d './examples/gradle/dokka-gradle-example' -v "1.9.20-SNAPSHOT" -p 8001
+```
+
+