Error with importing Telegram into Android Studio (using a version of Gradle that does not contain the method)

Question

I am newbie:) and trying to import telegram application into my Android Studio.

And now i have this error i can't solve it anyway.

Error:(10, 0) Gradle DSL method not found: 'android()'
Possible causes:<ul><li>The project 'Telegram-master' may be using a version of Gradle that does not contain the method.
<a href="open.wrapper.file">Open Gradle wrapper file</a></li><li>The build file may be missing a Gradle plugin.
<a href="apply.gradle.plugin">Apply Gradle plugin</a></li>

The Build.gradle :

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.3.1'
    }
}
android {
    buildToolsVersion '23.0.1'
}
dependencies {
}

Gradle.properties :

RELEASE_STORE_PASSWORD=password
RELEASE_KEY_ALIAS=alias
RELEASE_KEY_PASSWORD=password

gradle-wrapper.properties

#Tue Jun 16 02:56:07 KRAT 2015
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-2.5-all.zip

I've searched stack for this buT i couldn't solve it.

How can i solve this?

Thanks.