created materio_sapi module and draft of search form block

web/modules/custom/materio_sapi/materio_sapi.info.yml

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+name: Materio Serach API
+type: module
+description: 'Search Api Materio module'
+core: 8.x
+package: 'Materio'
+dependencies:
+  - search_api

web/modules/custom/materio_sapi/materio_sapi.module

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+<?php
+
+/**
+ * @file
+ * Contains materio_sapi.module.
+ */
+
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Implements hook_help().
+ */
+function materio_sapi_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    // Main module help for the materio_sapi module.
+    case 'help.page.materio_sapi':
+      $output = '';
+      $output .= '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('Search Api Materio module') . '</p>';
+      return $output;
+
+    default:
+  }
+}

web/modules/custom/materio_sapi/materio_sapi.permissions.yml

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+
+access materio search:
+  title: 'Access materio search'
+  description: 'Allow access to materio search'

web/modules/custom/materio_sapi/materio_sapi.routing.yml

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+#
+# materio_sapi.materio_sapi_search_form:
+#   path: '/materio_sapi/form/materio_sapi_search'
+#   defaults:
+#     _form: '\Drupal\materio_sapi\Form\MaterioSapiSearchForm'
+#     _title: 'MaterioSapiSearchForm'
+#   requirements:
+#     _access: 'TRUE'
+#

web/modules/custom/materio_sapi/src/Form/MaterioSapiSearchForm.php

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+<?php
+
+namespace Drupal\materio_sapi\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Class MaterioSapiSearchForm.
+ */
+class MaterioSapiSearchForm extends FormBase {
+
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'materio_sapi_search_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $form['search'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Search'),
+      '#maxlength' => 64,
+      '#size' => 64,
+      '#weight' => '0',
+    ];
+    $form['submit'] = [
+      '#type' => 'submit',
+      '#value' => $this->t('Submit'),
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    parent::validateForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // Display result.
+    foreach ($form_state->getValues() as $key => $value) {
+      drupal_set_message($key . ': ' . $value);
+    }
+
+  }
+
+}

web/modules/custom/materio_sapi/src/Plugin/Block/MaterioSapiSearchBlock.php

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+<?php
+
+namespace Drupal\materio_sapi\Plugin\Block;
+
+use Drupal\Core\Block\BlockBase;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Access\AccessResult;
+
+/**
+ * Provides a 'MaterioSapiSearchBlock' block.
+ *
+ * @Block(
+ *  id = "materio_sapi_search_block",
+ *  admin_label = @Translation("Materio sapi search block"),
+ * )
+ */
+class MaterioSapiSearchBlock extends BlockBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build() {
+    $build = [];
+    // $build['materio_sapi_search_block']['#markup'] = 'Implement MaterioSapiSearchBlock.';
+    $form = \Drupal::formBuilder()->getForm('Drupal\materio_sapi\Form\MaterioSapiSearchForm');
+    $build['materio_sapi_search_block'] = $form;
+    return $build;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function blockAccess(AccountInterface $account) {
+    return AccessResult::allowedIfHasPermission($account, 'access materio search');
+  }
+}