Add theme: koyel.

This is a parent theme for koyel-blog.

See #3461.

wp-content/themes/koyel/404.php

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+<?php
+/**
+ * The template for displaying 404 pages (not found)
+ *
+ * @link https://codex.wordpress.org/Creating_an_Error_404_Page
+ *
+ * @package Koyel
+ */
+
+get_header();
+?>
+<section class="breadcrumbs-area">
+	<div class="container">
+		<div class="row">
+			<div class="col-lg-12">
+				<h2><?php esc_html_e('404 Error Page','koyel'); ?></h2>
+			</div>
+		</div>
+	</div>
+</section>
+
+<section id="blog" class="section page error-page">
+	<div class="container">
+		<div class="row">
+			<div class="col-lg-12 text-center">
+				<h2><?php esc_html_e('Page not found!','koyel'); ?></h2>
+				<a href="<?php echo esc_url( home_url( '/' ) ); ?>" class="button error"><?php esc_html_e('Back To Home','koyel'); ?></a>
+			</div>
+		</div>
+	</div>
+</section>
+<?php 
+get_footer();

wp-content/themes/koyel/archive.php

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+<?php
+/**
+ * The template for displaying archive pages
+ *
+ * @link https://developer.wordpress.org/themes/basics/template-hierarchy/
+ *
+ * @package Koyel
+ */
+
+if( is_active_sidebar ( 'sidebar-1' ) ){
+	$koyel_column = 8;
+}else{
+	$koyel_column = 12;
+}
+get_header();
+?>
+<section class="breadcrumbs-area">
+	<div class="container">
+		<div class="row">
+			<div class="col-lg-12">
+				<?php
+					the_archive_title( '<h2 class="page-title">', '</h2>' );
+					the_archive_description( '<div class="archive-description">', '</div>' );
+				?>
+			</div>
+		</div>
+	</div>
+</section>
+
+<section class="blog-area <?php if( ! is_active_sidebar ('sidebar-1') ): ?>block-content-css<?php endif; ?>" id="content">
+	<div class="container">
+		<div class="row">
+			<div class="col-lg-<?php echo esc_attr ($koyel_column); ?>">
+				<?php if ( have_posts() ) : ?>
+					<?php
+					/* Start the Loop */
+					while ( have_posts() ) :
+						the_post();
+
+						/*
+						 * Include the Post-Type-specific template for the content.
+						 * If you want to override this in a child theme, then include a file
+						 * called content-___.php (where ___ is the Post Type name) and that will be used instead.
+						 */
+						get_template_part( 'template-parts/content', get_post_type() );
+
+					endwhile;
+
+					the_posts_navigation();
+
+				else :
+
+					get_template_part( 'template-parts/content', 'none' );
+
+				endif;
+				?>
+			</div>
+			<?php if(is_active_sidebar ('sidebar-1') ): ?>
+			<div class="col-lg-4">
+				<?php get_sidebar(); ?>
+			</div>
+			<?php endif; ?>
+		</div>
+	</div>
+</section>	
+
+<?php
+get_footer();