Introduce CODEOWNERS file to define responsibility for code in the …

…repository

CODEOWNERS

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+# Default owners for code review
+*              @developers
+
+# Default owners for file types
+*.js           @mbohal @bedrich-schindler @developers
+*.jsx          @mbohal @bedrich-schindler @developers
+*.md           @adamkudrna @developers
+*.scss         @adamkudrna @developers
+
+# Default owners for directories
+/docker        @mbohal @bedrich-schindler @developers
+/src/docs      @adamkudrna @developers
+
+# Default owners for specific files
+/.browserslistrc            @adamkudrna @developers
+/.eslintrc                  @mbohal @bedrich-schindler @developers
+/.markdownlint.jsonc        @adamkudrna @developers
+/babel.config.js            @mbohal @bedrich-schindler @developers
+/docker-compose.yml         @mbohal @bedrich-schindler @developers
+/jest.config.js             @mbohal @bedrich-schindler @developers
+/postcss.config.js          @adamkudrna @developers
+/stylelint.config.js        @adamkudrna @developers
+/webpack.config.babel.js    @mbohal @bedrich-schindler @developers