Add manga18free (#7726)

Added en/manga18free

src/en/manga18free/build.gradle

@@ -0,0 +1,10 @@
+ext {
+    extName = 'Manga18Free'
+    extClass = '.manga18free'
+    themePkg = 'madara'
+    baseUrl = 'https://manga18free.com'
+    overrideVersionCode = 1
+    isNsfw = true
+}
+
+apply from: "$rootDir/common.gradle"

src/en/manga18free/src/eu/kanade/tachiyomi/extension/en/manga18free/manga18free.kt

@@ -0,0 +1,11 @@
+package eu.kanade.tachiyomi.extension.en.manga18free
+
+import eu.kanade.tachiyomi.multisrc.madara.Madara
+
+class manga18free : Madara(
+    "Manga18Free",
+    "https://manga18free.com",
+    "en",
+) {
+    override fun searchMangaNextPageSelector() = "a.nextpostslink"
+}