Add JDBC sample and samples index page (#607)

* JIRA WDT-411 Add JDBC sample and samples index page, link to top level README

* JIRA WDT-411 Revise JDBC sample

* JIRA WDT-411 Revise JDBC sample from document review

* Issue #143 - Changes from review

* Issue #143 - Combine to a single sample

Author: rakillen

README.md

@@ -27,6 +27,7 @@ Many organizations are using WebLogic Server, with or without other Oracle Fusio
     - [ODL Configuration](site/odl_configuration.md)
     - [Configuring Oracle WebLogic Server Kubernetes Operator](site/kubernetes.md)
     - [Variable Injection](site/variable_injection.md)
+    - [Model Samples](site/samples/samples.md)
     - [Model Filters](site/tool_filters.md)
     - [The Archive File](site/archive.md)
 - [Downloading and Installing](#downloading-and-installing-the-software)

site/samples/jdbc.md

@@ -0,0 +1,34 @@
+## JDBC Sample
+
+This WDT domain model sample section has a typical configuration for a JDBC data source, including targeting information, connection pool parameters, and other details. 
+
+```yaml
+resources:
+    JDBCSystemResource:
+        'datasource-1':
+            Target: 'AdminServer,cluster-1'
+            JdbcResource:
+                DatasourceType: GENERIC
+                JDBCConnectionPoolParams:
+                    ConnectionReserveTimeoutSeconds: 10
+                    InitialCapacity: 0
+                    MaxCapacity: 5
+                    MinCapacity: 0
+                    TestConnectionsOnReserve: true
+                    TestTableName: SQL ISVALID
+                JDBCDriverParams:
+                    DriverName: oracle.jdbc.OracleDriver
+                    PasswordEncrypted: '@@PROP:jdbc.password@@'
+                    URL: 'jdbc:oracle:thin:@//localhost:1521/myDB'
+                    Properties:
+                        user:
+                            Value: scott
+```
+There are additional sub-folders and attributes available for more configuration options. These can be determined using the [Model Help Tool](../model_help.md). For example, this command will list the attributes and sub-folders for the `JDBCSystemResource/JdbcResource` folder:
+```yaml
+${WDT_HOME}/bin/modelHelp.sh -oracle_home /tmp/oracle resources:/JDBCSystemResource/JdbcResource
+```
+
+For this sample, the target cluster `cluster-1` should be defined elsewhere within this model, or should already exist in a domain that is being updated.
+ 
+It is recommended that credential fields, such as `PasswordEncrypted`, should not be stored as clear text in the model. Those values can be referenced in a separate variables file or in Kubernetes secrets, or the model can be encrypted using the [Encrypt Model Tool](../encrypt.md).

site/samples/samples.md

@@ -0,0 +1,10 @@
+# Model Samples
+
+These sample WDT domain models are provided as a starting point for creating your own working models. They include the most commonly used sub-folders and attributes. 
+
+You can use the [Model Help Tool](../model_help.md) to determine the complete list of sub-folders and attributes that can be used in a specific model location. For example, this command will list the attributes and sub-folders for the `JDBCSystemResource/JdbcResource` folder:
+```yaml
+${WDT_HOME}/bin/modelHelp.sh -oracle_home /tmp/oracle resources:/JDBCSystemResource/JdbcResource
+```
+## Contents
+- [JDBC Sample](jdbc.md)