Feature: Add India macro FRED series as friendly aliases

FRED hosts several India macroeconomic time series sourced from the IMF and OECD.These are valid, active FRED series.However,they are missing from the MACRO_SERIES alias table in fred.py.

When the news analyst or user calls get_macro_indicators("india_cpi", ...) or get_macro_indicators("rbi_lending_rate", ...), the function raises ValueError:Unknown macro indicator alias because neither alias exists. The LLM must guess raw FRED series IDs or omit macro indicators completely.

Series to Add:

Friendly Alias	FRED Series ID	Description
india_cpi	INDCPIALLMINMEI	India CPI All Items (monthly)
india_inflation	INDCPIALLMINMEI	Alias for india_cpi
rbi_lending_rate	INTDSRINM193N	RBI lending / discount rate
india_10y_yield	INDIRLTLT01STM	India 10Y government bond yield
usdinr	DEXINUS	USD/INR foreign exchange rate (daily)
india_gdp_per_capita	INDGDPRPCPPPT	India GDP per capita (PPP)

Kindly assign this to me