document dynamodb driver updates

adapter-dynamodb/src/main/resources/dynamodb.md

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+# dynamodb driver
+
+The DynamoDB driver supports a basic set of commands as specified at
+[Amazon DynamoDB Docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Operations_Amazon_DynamoDB.html).
+
+## Activity Parameters
+
+The activity parameters for this driver are basically properties for the DynamoDB driver.
+If any of these are not specified, then they are not applied to the client builder,
+thus the default is whatever it is for the native client.
+
+* `region` - The region which the driver should connect to. This is the
+  simplest way to configure the rest of the client, since defaults are
+  automatically looked up for the region. This is the only option that is
+  required.
+* `endpoint` - The endpoint for the region. Do not specify this if you have
+  already specified region.
+* `signing_region` - The signing region for the client. You do not have
+  to specify this if you specified region.
+* `client_socket_timeout` - adjust the default for the client session. (integer)
+* `client_execution_timeout` - adjust the default for the client session. (integer)
+* `client_max_connections` - adjust the default for the client session. (integer)
+* `client_max_error_retry` - adjust the default for the client session. (integer)
+* `client_user_agent_prefix` - adjust the default for the client session. (String)
+* `client_consecutive_retries_before_throttling` - adjust the default for
+  the client session. (integer)
+* `client_gzip` - adjust the default for the client session. (boolean)
+* `client_tcp_keepalive` - adjust the default for the client session. (boolean)
+* `client_disable_socket_proxy` - adjust the default for the client session. (boolean)
+* `client_so_send_size_hint` - adjust the default for the client session. (integer)
+* `client_so_recv_size_hint` - adjust the default for the client session. (integer)
+
+## Op Templates
+
+Specifically, the following commands are supported as of this release:
+
+* CreateTable
+* GetItem
+* PutItem
+* Query
+
+## Examples
+
+```yaml
+ops:
+
+  # the op name, used in logging and metrics
+  example-CreateTable:
+    # the type and target of the command
+    CreateTable: TEMPLATE(table,tabular)
+    # map of key structure for the table
+    Keys:
+      part: HASH
+      clust: RANGE
+    # attributes of the fields
+    Attributes:
+      part: S
+      clust: S
+    # either PROVISIONED or PAY_PER_REQUEST
+    BillingMode: PROVISIONED
+    # required for BillingMode: PROVISIONED
+    ReadCapacityUnits: "TEMPLATE(rcus,40000)"
+    # required for BillingMode: PROVISIONED
+    WriteCapacityUnits: "TEMPLATE(wcus,40000)"
+
+  example-PutItem:
+    # the type and target of the command
+    PutItem: TEMPLATE(table,tabular)
+    # A json payload
+    json: |
+      {
+       "part": "{part_layout}",
+       "clust": "{clust_layout}",
+       "data0": "{data0}"
+      }
+
+  example-GetItem:
+    # the type and target of the command
+    GetItem: TEMPLATE(table,tabular)
+    # the identifiers for the item to read
+    key:
+      part: "{part_read}"
+      clust: "{clust_read}"
+    ## optionally, set a projection
+    # projection: projection-spec
+    # optionally, override ConsistentRead defaults
+    ConsistentRead: true
+
+
+  example-Query:
+    # the type and target of the command
+    Query: TEMPLATE(table,tabular)
+    # The query key
+    key:
+      part: "{part_read}"
+      clust: "{clust_read}"
+    # optionally, override the default for ConsistentRead
+    ConsistentRead: true
+    # optionally, set a limit
+    Limit: "{limit}"
+    ## optionally, set a projection
+    # projection: projection-spec
+    ## optionally, set an exclusive start key
+    # ExclusiveStartKey: key-spec
+
+```