Merge pull request #1367 from greenart7c3/nip_55_flags

NIP-55: Add intent flags to open the signer once when sending multiple events

55.md

@@ -72,6 +72,35 @@ Set the Signer package name:
 intent.`package` = "com.example.signer"
 ```
 
+If you are sending multiple intents without awaiting you can add some intent flags to sign all events without opening multiple times the signer
+
+```kotlin
+intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP or Intent.FLAG_ACTIVITY_CLEAR_TOP)
+```
+
+If you are developing a signer application them you need to add this to your AndroidManifest.xml so clients can use the intent flags above
+
+```kotlin
+android:launchMode="singleTop"
+```
+
+Signer MUST answer multiple permissions with an array of results
+
+```kotlin
+
+val results = listOf(
+  Result(
+    package = signerPackageName,
+    result = eventSignture,
+    id = intentId
+  )
+)
+
+val json = results.toJson()
+
+intent.putExtra("results", json)
+```
+
 Send the Intent:
 
 ```kotlin