Update promise documentation

JavaScript-Runtime-(JSRT)-Reference.md

@@ -36,6 +36,7 @@ References of JSRT typedefs, constants, enumerations and APIs.
 * [[JsModuleHostInfoKind]]
 * [[JsParseModuleSourceFlags]]
 * [[JsParseScriptAttributes]]
+* [[JsPromiseState]]
 * [[JsPropertyIdType]]
 * [[JsRuntimeAttributes]]
 * [[JsTypedArrayType]]
@@ -107,6 +108,8 @@ References of JSRT typedefs, constants, enumerations and APIs.
 * [[JsGetOwnPropertyDescriptor]]
 * [[JsGetOwnPropertyNames]]
 * [[JsGetOwnPropertySymbols]]
+* [[JsGetPromiseResult]]
+* [[JsGetPromiseState]]
 * [[JsGetProperty]]
 * [[JsGetPropertyIdFromName]]
 * [[JsGetPropertyIdFromSymbol]]

reference/JsGetPromiseResult.md

@@ -0,0 +1,21 @@
+Gets the result of a given promise object.
+
+### Syntax 
+```
+CHAKRA_API
+    JsGetPromiseResult(
+        _In_ JsValueRef *promise,
+        _Out_ JsPromiseState *statusCode);
+```
+
+### Parameters 
+* __promise__: The Promise object.
+* __statusCode__: The result of the Promise.
+
+### Return Value 
+The code **JsNoError** if the operation succeeded, a failure code otherwise.
+
+### Remarks 
+**This API is experimental and may have breaking change later.** 
+
+Requires an active script context.

reference/JsGetPromiseState.md

@@ -0,0 +1,21 @@
+Gets the state of a given `Promise` object.
+
+### Syntax 
+```
+CHAKRA_API
+    JsGetPromiseState(
+        _In_ JsValueRef *promise,
+        _Out_ JsPromiseState *statusCode);
+```
+
+### Parameters 
+* __promise__: The `Promise` object.
+* __statusCode__: The current state of the `Promise` object.
+
+### Return Value 
+The code **JsNoError** if the operation succeeded, a failure code otherwise.
+
+### Remarks 
+**This API is experimental and may have breaking change later.** 
+
+Requires an active script context.

reference/JsPromiseState.md

@@ -0,0 +1,11 @@
+The possible states for a `Promise` object.
+
+### Syntax 
+```
+enum JsPromiseState
+```
+
+### Members 
+* __JsPromiseState_Pending__: The `Promise` has not yet been fulfilled or rejected.
+* __JsPromiseState_Fulfilled__: The `Promise` has been fulfilled.
+* __JsPromiseState_Rejected__: The `Promise` has been rejected.