Add "riesgo pais" indicators & yields

[ddnt1]

Riesgo pais:

• UBI/URUBI: https://www.rafap.com.uy/mvdcms/Institucional/UBI-uc89
• IRU/IRUBEVSA: https://web.bevsa.com.uy/CurvasVectorPrecios/CurvasIndices/IRUBEVSA.aspx
• 5/10y CDS (are they publicly available?)

Yield curves:

• USD: https://web.bevsa.com.uy/CurvasVectorPrecios/CurvasIndices/CUD.aspx
• UYP: https://web.bevsa.com.uy/CurvasVectorPrecios/CurvasIndices/ITLUP.aspx
• UI: https://web.bevsa.com.uy/CurvasVectorPrecios/CurvasIndices/CUI.aspx
• UP: https://web.bevsa.com.uy/CurvasVectorPrecios/CurvasIndices/CUP.aspx