Add issue files

Author: jacobcassidy

.dev-assets/syntax-issues/bugs/nth-issue.css

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+/* https://github.com/microsoft/vscode-css/issues/33 */
+
+table thead tr:nth-child(odd of :not([hidden])),
+table:has(thead tr:last-child:nth-child(even of :not([hidden]))) tbody tr:nth-child(odd of :not([hidden])),
+table:has(thead tr:last-child:nth-child(odd of :not([hidden]))) tbody tr:nth-child(even of :not([hidden])),
+table:has(thead tr:last-child:nth-child(even of :not([hidden]))):has(tbody tr:last-child:nth-child(odd of :not([hidden]))) tfoot tr:nth-child(even of :not([hidden])),
+table:has(thead tr:last-child:nth-child(even of :not([hidden]))):has(tbody tr:last-child:nth-child(even of :not([hidden]))) tfoot tr:nth-child(odd of :not([hidden])),
+table:has(thead tr:last-child:nth-child(odd of :not([hidden]))):has(tbody tr:last-child:nth-child(odd of :not([hidden]))) tfoot tr:nth-child(odd of :not([hidden])),
+table:has(thead tr:last-child:nth-child(odd of :not([hidden]))):has(tbody tr:last-child:nth-child(even of :not([hidden]))) tfoot tr:nth-child(even of :not([hidden])) {
+  background-color: #f0f0f0;
+}

.dev-assets/syntax-issues/fixed/at-property-issue.css

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+@property --foobar {
+    syntax: '<length>';
+}

.dev-assets/syntax-issues/fixed/lvmax-issue.css

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+/* https://github.com/microsoft/vscode-css/issues/42 */
+.example-max {
+  width: 200lvmax;
+  width: 200svmax;
+  width: 200vmax;
+}
+
+.example-min {
+  width: 200lvmin;
+  width: 200svmin;
+  width: 200vmin;
+}

.dev-assets/syntax-issues/fixed/multiline-string-issue.css

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+/* https://github.com/microsoft/vscode-css/issues/28 */
+
+@import url('a-really-long\
+    -url');