Simplify contributing and hightlight CLA

.github/ISSUE_TEMPLATE/0-default.yml

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+name: Default
+description: Feature request or bug report
+body:
+  - type: markdown
+    attributes:
+        value: |
+            **Note:** By creating a PR or an issue you automatically agree to the CLA. See [CONTRIBUTING.md](https://github.com/userver-framework/realmedium_sample/blob/develop/CONTRIBUTING.md).
+  - type: textarea
+    id: what-happened
+    attributes:
+        label: Add a description
+        placeholder: Tell us what you see!
+    validations:
+        required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/pull_request_template.md

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+
+
+
+
+
+
+
+------------------------
+Note: by creating a PR or an issue you automatically agree to the CLA. See [CONTRIBUTING.md](https://github.com/userver-framework/realmedium_sample/blob/develop/CONTRIBUTING.md). Feel free to remove this note, the agreement holds.
+

CODE_OF_CONDUCT.md

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+We welcome everyone to contribute to our product, see CONTRIBUTING.md.

CONTRIBUTING.md

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+# Notice to external contributors
+
+
+## General info
+
+Hello! In order for us (YANDEX LLC) to accept patches and other contributions from you, you will have to adopt our Yandex Contributor License Agreement (the **CLA**). The current version of the CLA can be found here:
+1) https://yandex.ru/legal/cla/?lang=en (in English) and 
+2) https://yandex.ru/legal/cla/?lang=ru (in Russian).
+
+By adopting the CLA, you state the following:
+
+* You obviously wish and are willingly licensing your contributions to us for our open source projects under the terms of the CLA,
+* You have read the terms and conditions of the CLA and agree with them in full,
+* You are legally able to provide and license your contributions as stated,
+* We may use your contributions for our open source projects and for any other our project too,
+* We rely on your assurances concerning the rights of third parties in relation to your contributions.
+
+If you agree with these principles, please read and adopt our CLA. By providing us your contributions, you hereby declare that you have already read and adopt our CLA, and we may freely merge your contributions with our corresponding open source project and use it in further in accordance with terms and conditions of the CLA.
+
+
+## Other questions
+
+If you have any questions, please mail us at opensource@yandex-team.ru.