Add extra placeholders for Matrix ID room invites notifications

- Sender display name, if available
- Room name, if available

src/main/java/io/kamax/mxisd/config/memory/MemoryIdentityConfig.java

@@ -30,6 +30,7 @@ public class MemoryIdentityConfig {
 
     private String username;
     private String password;
+    private String displayName;
     private List<MemoryThreePid> threepids = new ArrayList<>();
     private List<String> roles = new ArrayList<>();
 
@@ -49,6 +50,14 @@ public class MemoryIdentityConfig {
         this.password = password;
     }
 
+    public String getDisplayName() {
+        return displayName;
+    }
+
+    public void setDisplayName(String displayName) {
+        this.displayName = displayName;
+    }
+
     public List<MemoryThreePid> getThreepids() {
         return threepids;
     }