created materio_sapi module and draft of search form block

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

@@ -0,0 +1,58 @@
+<?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);
+    }
+
+  }
+
+}