Add Chuvash layout (#677)

Co-authored-by: tenextractor <tenextractor@outlook.com>

app/src/main/assets/language_key_texts/cv.txt

@@ -0,0 +1,20 @@
+[popup_keys]
+" « » „ “ ”
+у у́ ү ӯ
+к қ
+е е́ ә
+н ң
+г ғ
+х ҳ
+ы ы́
+а а́
+о о́ ө
+ж җ
+э э́ є
+я я́
+ч ҷ
+и и́ і ӣ
+ю ю́
+
+[labels]
+alphabet: АБВ

app/src/main/assets/layouts/chuvash.txt

@@ -0,0 +1,44 @@
+ё
+ӑ
+ӗ
+ҫ
+ӳ
+ъ
+-
+!
+?
+"
+
+й
+ц
+у
+к
+е
+н
+г
+ш
+щ
+з
+х
+
+ф
+ы
+в
+а
+п
+р
+о
+л
+д
+ж
+э
+
+я
+ч
+с
+м
+и
+т
+ь
+б
+ю

app/src/main/java/helium314/keyboard/latin/utils/ScriptUtils.kt

@@ -165,7 +165,7 @@ object ScriptUtils {
             "ar", "ur", "fa" -> SCRIPT_ARABIC
             "hy" -> SCRIPT_ARMENIAN
             "bn" -> SCRIPT_BENGALI
-            "sr", "mk", "ru", "uk", "mn", "be", "kk", "ky", "bg", "xdq" -> SCRIPT_CYRILLIC
+            "sr", "mk", "ru", "uk", "mn", "be", "kk", "ky", "bg", "xdq", "cv" -> SCRIPT_CYRILLIC
             "ka" -> SCRIPT_GEORGIAN
             "el" -> SCRIPT_GREEK
             "iw" -> SCRIPT_HEBREW

app/src/main/res/xml/method.xml

@@ -23,6 +23,7 @@
     bn_IN: Bengali (India)/bengali
     ca: Catalan/qwerty+
     cs: Czech/qwertz
+    cv: Chuvash/chuvash
     da: Danish/qwerty+
     de: German/qwertz
     de_DE: German (Germany)/qwertz+
@@ -269,6 +270,15 @@
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwertz,AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
             android:isAsciiCapable="true"
     />
+    <subtype android:icon="@drawable/ic_ime_switcher"
+            android:label="@string/subtype_generic"
+            android:subtypeId="0xdf43fc1d"
+            android:imeSubtypeLocale="cv"
+            android:languageTag="cv"
+            android:imeSubtypeMode="keyboard"
+            android:imeSubtypeExtraValue="KeyboardLayoutSet=chuvash,EmojiCapable"
+            android:isAsciiCapable="false"
+    />
     <subtype android:icon="@drawable/ic_ime_switcher"
             android:label="@string/subtype_generic"
             android:subtypeId="0x2df4605d"