Add documentation (WIP)

README.md

@@ -56,3 +56,91 @@ With clone:
             // ...
         );
     }
+
+### Basic configuration
+
+#### Declare a client 
+
+Elasticsearch client is comparable to doctrine connection.
+Most of the time, you will need only one.
+
+    #app/config/config.yml
+    foq_elastica:
+        clients:
+            default: { host: localhost, port: 9200 }
+
+#### Declare an index
+
+Elasticsearch index is comparable to doctrine entity manager.
+Most of the time, you will need only one.
+
+    foq_elastica:
+        clients:
+            default: { host: localhost, port: 9200 }
+        indexes:
+            website:
+                client: default
+
+Here we created a "website" index, that uses our "default" client.
+
+#### Declare a type
+
+Elasticsearch type is comparable to doctrine entity repository.
+
+    foq_elastica:
+        clients:
+            default: { host: localhost, port: 9200 }
+        indexes:
+            website:
+                client: default
+                types:
+                    user:
+                        mappings:
+                            username: { boost: 5 }
+                            firstName: { boost: 3 }
+                            lastName: { boost: 3 }
+                            aboutMe: 
+
+### Populate the types
+
+    php app/console foq:elastica:populate
+
+This command needs providers to insert new documents in the elasticsearch types.
+There are 2 ways to create providers.
+If your elasticsearch type matches a doctrine repository, go for the doctrine automatic provider.
+Or, for complete flexibility, go for explicit provider.
+
+#### Doctrine automatic provider
+
+If we want to index the entities from a doctrine repository,
+a little bit a configuration will let ElasticaBundle do it for us.
+
+    foq_elastica:
+        clients:
+            default: { host: localhost, port: 9200 }
+        indexes:
+            website:
+                client: default
+                types:
+                    user:
+                        mappings:
+                            # your mappings
+                    doctrine:
+                        driver: orm
+                        model: Application\UserBundle\Entity\User
+                        provider:
+
+Two drivers are actually supported: orm and mongodb.
+
+##### Use a custom doctrine query builder
+
+You can control which entitie will be indexed by specifying a custom query builder method.
+
+                    doctrine:
+                        driver: orm
+                        model: Application\UserBundle\Entity\User
+                        provider:
+                            query_builder_method: createIsActiveQueryBuilder
+
+Your repository must implement this method and return a doctrine query builder.
+