add README for azure-functions-java-core

azure-functions-java-core/README.md

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+# Azure Functions Java Core
+
+This package contains libraries to author Azure Functions in Java.
+
+### Usage
+Use this package by including the following snippet in your `pom.xml`.
+
+```xml
+<dependency>
+    <groupId>com.microsoft.azure.serverless</groupId>
+    <artifactId>azure-function-java-core</artifactId>
+    <version>1.0-SNAPSHOT</version>
+</dependency>
+```
+
+### Annotation for Triggers and Bindings
+Instead of writing `function.json`, you can use annotations in code to specify triggers and bindings of your functions.
+`function.json` can be automatically generated by [Maven Plugin for Azure Functions](https://github.com/Microsoft/azure-maven-plugins/tree/master/azure-functions-maven-plugin). 
+
+The following table lists the Java annotations for each binding type.
+
+Binding | Annotation
+---|---
+CosmosDB | N/A
+Event Hubs | <ul><li>`EventHubTrigger`</li><li>`EventHubOutput`</li></ul> 
+HTTP | <ul><li>`HttpTrigger`</li><li>`HttpOutput`</li></ul>
+Mobile Apps | N/A
+Notification Hubs | N/A
+Service Bus | <ul><li>`ServiceBusQueueTrigger`</li><li>`ServiceBusQueueOutput`</li><li>`ServiceBusTopicTrigger`</li><li>`ServiceBusTopicOutput`</li></ul>
+Storage Blob | <ul><li>`BlobTrigger`</li><li>`BlobOutput`</li><li>`StorageAccount`</li></ul>
+Storage Queue | <ul><li>`QueueTrigger`</li><li>`QueueOutput`</li><li>`StorageAccount`</li></ul>
+Storage Table | <ul><li>`TableInput`</li><li>`TableOutput`</li><li>`StorageAccount`</li></ul>
+Timer | <ul><li>`TimerTrigger`</li></ul>
+Twilio | N/A