Add package info files

Author: theEvilReaper

src/main/java/net/onelitefeather/guira/data/package-info.java

@@ -0,0 +1,4 @@
+@NotNullByDefault
+package net.onelitefeather.guira.data;
+
+import org.jetbrains.annotations.NotNullByDefault;

src/main/java/net/onelitefeather/guira/event/package-info.java

@@ -0,0 +1,4 @@
+@NotNullByDefault
+package net.onelitefeather.guira.event;
+
+import org.jetbrains.annotations.NotNullByDefault;

src/main/java/net/onelitefeather/guira/functional/package-info.java

@@ -0,0 +1,4 @@
+@NotNullByDefault
+package net.onelitefeather.guira.functional;
+
+import org.jetbrains.annotations.NotNullByDefault;

src/main/java/net/onelitefeather/guira/package-info.java

@@ -0,0 +1,4 @@
+@NotNullByDefault
+package net.onelitefeather.guira;
+
+import org.jetbrains.annotations.NotNullByDefault;