Added CI documentation (#16129)

docs/dev/enabling_ci_step.md

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+# Enabling tests in OpenVINO CI
+
+Each component contains own documentation for writing and extending tests.
+If you want to get more information about it please read the documentation for interested [component](../../src/README.md).
+
+This guide oversees existed OpenVINO CIs.
+
+OpenVINO has two types of public CIs: [Azure](../../.ci/azure) and [Github actions](../../.github/workflows).
+
+ * [Github actions](../../.github/workflows) is used for documentation build and additional checks.
+ * [Azure](../../.ci/azure) is used for public build on different platforms. If you need to run tests from new binary files, you can add it to these configuration files.
+
+## See Also
+
+ * [OpenVINO README](../../README.md)
+ * [OpenVINO Developer Documentation](./index.md)