Added changelog for the cloud native ebook

Cloud-Native-eBook-changelog.md

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+## eBook -  Architecting Cloud Native .NET Applications for Azure
+
+### Release 1.1 (2020-11-12)
+
+Reference commits : [19435cc](https://github.com/dotnet/docs/commit/19435cc115c316573a036f2c78d8032064ac9321), [153df0e](https://github.com/dotnet/docs/commit/153df0eaf4f6acd340e77818c6b617d9e554f004), [cc64143](https://github.com/dotnet/docs/commit/cc64143cb9e691d7668621429a96a167cf022214), [891eeac](https://github.com/dotnet/docs/commit/891eeac17df20ab1ddf7a6cfaa753bb180c90b88), [03479bd](https://github.com/dotnet/docs/commit/03479bdfb3f4c70854d025d7811213f93b4439fc), [a5e5037](https://github.com/dotnet/docs/commit/a5e5037d9ca566cdd9024b313874da53993cbd9e), [9440064](https://github.com/dotnet/docs/commit/94400642eb02ec5a7c76815898e5d6c853277005)
+
+- Updates Azure Monitor specific content in the following pages :
+    - `Azure Monitor`
+    - `Observability patterns`
+    - `Service-to-service communication`
+- Fixes the code block annotation in the following pages :
+    - `Feature flags`
+    - `Leveraging containers and orchestrators`
+- Changes docs prefix (https://docs.microsoft.com) in the following pages :    
+    - `Cloud Native Application Bundles`
+    - `Application resiliency patterns`
+    - `Authentication and Authorization in cloud-native apps`
+    - `Azure Active Directory`
+    - `Caching in a cloud-native application`
+    - `Azure Monitor`
+    - `Azure security for cloud-native apps`
+    - `Candidate apps for cloud native`
+    - `Centralized configuration`
+    - `Combining containers and serverless approaches for cloud-native services`
+    - `Cloud-native communication patterns`
+    - `Defining Cloud Native`
+    - `Deploying containers in Azure`
+    - `Deploying eShopOnContainers to Azure`
+    - `DevOps`
+    - `Distributed data`
+    - `Elasticsearch in cloud-native applications`
+    - `Feature flags`
+    - `Front-end client communication`
+    - `gRPC`
+    - `IdentityServer for Cloud Native Apps`
+    - `Identity`
+    - `Infrastructure as code`
+    - `Azure platform resiliency`
+    - `Leveraging containers and orchestrators`
+    - `Logging with Elastic Stack`
+    - `Mapping eShopOnContainers to Azure Services`
+    - `Monitoring in Azure Kubernetes Services`
+- Updates the cloud native definition in page `Defining Cloud Native`
+- Updates deployment section in page `Leveraging containers and orchestrators`
+- Fixes typo in page `Relational vs. NoSQL data`
+- Fixes multi AKS cluster statement in page `Mapping eShopOnContainers to Azure Services`
+
+Contributors : @robvet, @nschonni, @DCtheGeek, @karoldeland, @Resolved817