add share buttons above my posts without plugins

Use This Code May Help You:

add_filter('the_content', 'br_content_with_social_buttons');
    function br_content_with_social_buttons($content){
        $url = urlencode(get_permalink());
        // Get current page title
        $title = str_replace(' ', '%20', get_the_title());
        $blog_title = get_bloginfo('name');
        $sharebuttons="
        <div id="social-share">
            <strong><span>Sharing is caring</span></strong> <i class="fa fa-share-alt"></i>&nbsp;&nbsp;
            <a href="https://www.facebook.com/sharer.php?u=".$url.'" target="_blank" class="facebook"><i class="fa fa-facebook"></i> <span>Share</span></a>
            <a href="https://plus.google.com/share?url=".$url."" target="_blank" class="gplus"><i class="fa fa-google-plus"></i> <span>+1</span></a>
            <a href="https://twitter.com/intent/tweet?text=".$title."&amp;url=".$url."&amp;via=YOUR_TWITTER_HANDLE_HERE" target="_blank" class="twitter"><i class="fa fa-twitter"></i> <span>Tweet</span></a>
            <a href="http://www.linkedin.com/shareArticle?mini=true&amp;url=".$title."" target="_blank" class="linkedin"><i class="fa fa-linkedin"></i> <span>Share</span></a>
            <a href="whatsapp://send?text=".$title." '.$url.'" target="_blank" class="whatsapp"><i class="fa fa-whatsapp"></i> <span>Share</span></a>
        </div>';
        return $sharebuttons.$content;
    }