feat: update java readme with version and directive (#8834)

Author: ChenTanyi

specification/apimanagement/resource-manager/readme.java.md

@@ -16,6 +16,7 @@ output-folder: $(azure-libraries-for-java-folder)/azure-mgmt-apimanagement
 
 ``` yaml $(java) && $(multiapi)
 batch:
+  - tag: package-2019-12
   - tag: package-2019-01
   - tag: package-2018-06-preview
   - tag: package-2018-01
@@ -24,6 +25,19 @@ batch:
   - tag: package-2016-07
 ```
 
+### Tag: package-2019-12 and java
+
+These settings apply only when `--tag=package-2019-12 --java` is specified on the command line.
+Please also specify `--azure-libraries-for-java=<path to the root directory of your azure-sdk-for-java clone>`.
+
+``` yaml $(tag) == 'package-2019-12' && $(java) && $(multiapi)
+java:
+  namespace: com.microsoft.azure.management.apimanagement.v2019_12_01
+  output-folder: $(azure-libraries-for-java-folder)/sdk/apimanagement/mgmt-v2019_12_01
+regenerate-manager: true
+generate-interface: true
+```
+
 ### Tag: package-2019-01 and java
 
 These settings apply only when `--tag=package-2019-01 --java` is specified on the command line.

specification/containerregistry/resource-manager/readme.java.md

@@ -12,6 +12,15 @@ payload-flattening-threshold: 1
 output-folder: $(azure-libraries-for-java-folder)/azure-mgmt-containerregistry
 ```
 
+These settings apply only when `--multiapi` is not specified on the command line.
+
+``` yaml $(java) && !$(multiapi)
+directive:
+  - rename-model:
+      from: DockerBuildStep
+      to: DockerTaskStep
+```
+
 ### Java multi-api
 
 ``` yaml $(java) && $(multiapi)

specification/recoveryservicesbackup/resource-manager/readme.java.md

@@ -18,6 +18,24 @@ output-folder: $(azure-libraries-for-java-folder)/azure-mgmt-recoveryservicesbac
 ``` yaml $(java) && $(multiapi)
 batch:
   - tag: package-2016-08
+  - tag: package-2020-02
+directive:
+  - rename-operation:
+      from: Operations_List
+      to: Operation_List
+```
+
+### Tag: package-2020-02 and java
+
+These settings apply only when `--tag=package-2020-02 --java` is specified on the command line.
+Please also specify `--azure-libraries-for-java=<path to the root directory of your azure-sdk-for-java clone>`.
+
+``` yaml $(tag) == 'package-2020-02' && $(java) && $(multiapi)
+java:
+  namespace: com.microsoft.azure.management.recoveryservices.backup.v2020_02_02
+  output-folder: $(azure-libraries-for-java-folder)/sdk/recoveryservices.backup/mgmt-v2020_02_02
+regenerate-manager: true
+generate-interface: true
 ```
 
 ### Tag: package-2016-08 and java