Update Kusarek.json

<!-- Please complete this template so we can review your pull request faster. --> ## Requirements
Unless explicitly specified otherwise by a **maintainer** or in the requirement description, your domain must pass **ALL** the indicated requirements above. Please note that we reserve the rights not to accept any domain at our own discretion.
- [ x ] The file is in the `domains` folder and is in the JSON format.
- [ x ] The file's name is all lowercased and alphanumeric. <!-- Your file's name is yourname.json, not YourName.json or your_name.json. --> -[ x ] You have completed your website. <!-- This is not required if the domain you're registering is for emails. --> [ x ] The website is reachable. <!-- This is not required if the domain you're registering is for emails. -->
- [ x ] You're not using Vercel. <!-- This is not required if you're using an URL record. -->
- [ x ] The CNAME record doesn't contain 'https://' or '/. <!-- This is not required if you are not using a CNAME record. -->
- [ x ] There is sufficient information at the `owner field. <!-- You need to have your email presented at `email` field. If you don't want to provide your email for any reason, you can specify another social platform (e.g. Twitter) so we can contact you. --> ## Website Link/Preview
<!-- Please provide a link or preview of your website below. If you can't make the website visible, then an image of the website is also fine! -->

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YOU MUST FILL OUT THIS TEMPLATE ENTIRELY FOR YOUR PR TO BE ACCEPTED, NONE OF IT IS OPTIONAL UNLESS SPECIFIED.
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# Requirements
<!-- Your domain MUST pass ALL the requirements below, otherwise it WILL BE DENIED. -->

<!-- Change each checkbox to [x] (all lowercase, with no spaces between the brackets) to mark it as completed. -->

- [ x ] I have **read** and **agreed** to the [Terms of Service](https://is-a.dev/terms). <!-- Your request MUST follow the TOS to be approved. -->
- [ x ] My file is following the [domain structure](https://docs.is-a.dev/domain-structure/).
- [ x  ] My website is **reachable** and **completed**. <!-- We do not permit simple "Hello, world!" or simply copied/mostly blank templated websites. -->
- [ x ] My website is **software development** related. <!-- Only your root subdomain needs to meet this requirement. -->
- [ x ] My website is not for commercial use. <!-- Your website's purpose should not be to generate any form of revenue. -->
- [ x ] I have provided sufficient contact information in the `owner` key. <!-- Provide your email in the `email` field or another platform (e.g. X/Twitter or Discord) for contact. -->
- [ x ] I have provided a preview of my website below. <!-- This step is required for your domain to be approved. -->

# Website Preview
<!-- Provide a link or screenshot of your website below. -->
<img width="1920" height="1080" alt="obrazek" src="https://github.com/user-attachments/assets/3c365e07-cadb-41f3-bb98-a780ad08361e" />
<img width="1919" height="1079" alt="obrazek" src="https://github.com/user-attachments/assets/7783d55d-778f-453a-a3d3-1013776bfc79" />
<img width="1919" height="1079" alt="obrazek" src="https://github.com/user-attachments/assets/1a9dbca4-433e-44f9-a173-c3b371b38b1c" />

domains/Kusarek.json

@@ -1,6 +1,7 @@
 {
     "owner": {
         "username": "KusarekCZE"
+        "email": "kusarekofficial@gmail.com"
     },
     "records": {
         "CNAME": "KusarekCZE.github.io"