Update README.md

Added TV Platform Spec to list with relative link

Signed-off-by: Robert Wolff <robert.wolff@linaro.org>

Author: Robert Wolff

Specifications/README.md

@@ -4,3 +4,4 @@
    - Low-cost Hardware Platform Specification
 - [Enterprise Edition Specification](../96BoardsEESpecificationv1.0.pdf)
    - Server Hardware Platform Specification
+- [TV Platform Specification](96Boards-EE-TV-Platform-Specification.pdf)