Add MangaNinja (#4168)

src/pt/manganinja/build.gradle

@@ -0,0 +1,9 @@
+ext {
+    extName = 'Mangá Ninja'
+    extClass = '.MangaNinja'
+    themePkg = 'madara'
+    baseUrl = 'https://manganinja.com'
+    overrideVersionCode = 0
+}
+
+apply from: "$rootDir/common.gradle"

src/pt/manganinja/src/eu/kanade/tachiyomi/extension/pt/manganinja/MangaNinja.kt

@@ -0,0 +1,20 @@
+package eu.kanade.tachiyomi.extension.pt.manganinja
+
+import eu.kanade.tachiyomi.multisrc.madara.Madara
+import eu.kanade.tachiyomi.network.interceptor.rateLimit
+import java.text.SimpleDateFormat
+import java.util.Locale
+
+class MangaNinja : Madara(
+    "Mangá Ninja",
+    "https://manganinja.com",
+    "pt-BR",
+    SimpleDateFormat("dd/MM/yyyy", Locale.ROOT),
+) {
+
+    override val client = super.client.newBuilder()
+        .rateLimit(2)
+        .build()
+
+    override val useLoadMoreRequest = LoadMoreStrategy.Never
+}