Add plugin modules

core/shared/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>

core/shared/src/main/java/de/mm20/launcher2/provider/accounts/AccountPluginContract.kt

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+package de.mm20.launcher2.provider.accounts
+
+object AccountPluginContract {
+    object Accounts {
+        const val Id = "id"
+        const val DisplayName = "display_name"
+        const val Type = "type"
+    }
+    object AccountTypes {
+        const val Id = "id"
+        const val DisplayName = "display_name"
+        const val SupportsMultipleAccounts = "supports_multiple_accounts"
+    }
+}

core/shared/src/main/java/de/mm20/launcher2/provider/files/FilePluginContract.kt

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+package de.mm20.launcher2.provider.files
+
+import android.content.ContentUris
+import android.net.Uri
+
+object FilePluginContract {
+    object Roots {
+        const val Id = "id"
+        const val DisplayName = "display_name"
+        const val Description = "description"
+        const val Status = "status"
+        const val AccountAuthority = "account_authority"
+
+        const val PathSegment = "roots"
+
+        fun getContentUri(authority: String): Uri {
+            return Uri.Builder()
+                .scheme("content")
+                .authority(authority)
+                .path(PathSegment)
+                .build()
+        }
+    }
+
+    object Files {
+        /**
+         * The unique ID of the file.
+         * Type: String
+         */
+        const val Id = "id"
+
+        /**
+         * The display name of the file.
+         * Type: String
+         */
+        const val DisplayName = "display_name"
+
+        /**
+         * The MIME type of the file.
+         * Type: String?
+         */
+        const val MimeType = "mime_type"
+
+        /**
+         * The size of the file in bytes.
+         * Type: Long?
+         */
+        const val Size = "size"
+
+        /**
+         * The display path of the file.
+         * Type: String?
+         */
+        const val Path = "path"
+
+        const val MetaTitle = "meta_title"
+        const val MetaArtist = "meta_artist"
+        const val MetaAlbum = "meta_album"
+        const val MetaDuration = "meta_duration"
+        const val MetaYear = "meta_year"
+        const val MetaWidth = "meta_width"
+        const val MetaHeight = "meta_height"
+        const val MetaLocation = "meta_location"
+        const val MetaAppName = "meta_app_name"
+        const val MetaAppPackageName = "meta_app_package_name"
+        const val MetaAppMinSdkVersion = "meta_app_min_sdk_version"
+        const val MetaOwner = "meta_owner"
+    }
+}