search-enabler doc added

docs/source/search-enabler/search-enabler.rst

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+Seach-enabler
+============
+
+The search-enabler component is targeted to REST endpoint for GraphQL queries coming from IoT applications.
+
+For creating, debugging and testing GraphQL queries a GraphiQL GUI environment provided. 
+
+See the `tutorial <../tutorials/graphql_search.html>`_ for more details.
+
+Build
+########
+The search-enabler is implemented using as IoTCrawlerClient provided by a core library (see `Orchestrator <../orchrestrator/orchrestrator.html>`_ for more details). As a result it builds orchestrator library during the build process.
+
+`sh make.sh install`
+
+During the build process all the modules are will be installed installed into a local maven repository.
+
+Deployment
+########
+The search-enabler is deployable as a docker container.
+
+A docker image for deployment can be build by the following command:
+
+`sh make.sh build-image`
+
+.. note::  A Google's Jib maven plugin is used for building image, so there is no traditional Dockerfile. Use build-command instead.
+
+A `helm chart <https://github.com/IoTCrawler/Search-Enabler/tree/master/chart>`_ configures the search-enabler to be deployed on Kubernetes cluster.
+
+A `gitlab CI configuration <https://github.com/IoTCrawler/Search-Enabler/blob/master/.gitlab-ci.yml>`_ configures the building process deployment flow.
+
+Configuration
+########
+
+#. **IOTCRAWLER_ORCHESTRATOR_URL** - URL of NGSI-LD endpoint (orchestrator or MDR Broker).
+#. **VERSION** - for debug purposes during deployment. Automatically taken for the commit ID during image build.
+