add inj sponsored feed (#306)

Author: mariobern

pages/price-feeds/sponsored-feeds.mdx

@@ -48,6 +48,7 @@ The addresses represent the price feed account for shard 0 of the relevant price
 | EUR/USD     | `Fu76ChamBDjE8UuGLV6GP2AcPPSU6gjhkNhAyuoPm7ny` | `a995d00bb36a63cef7fd2c287dc105fc8f3d93779f062f09551b0af3e81ec30b` |
 | XAG/USD     | `H9JxsWwtDZxjSL6m7cdCVsWibj3JBMD9sxqLjadoZnot` | `f2fb02c32b055c805e7238d628e5e9dadef274376114eb1f012337cabe93871e` |
 | XAU/USD     | `2uPQGpm8X4ZkxMHxrAW1QuhXcse1AHEgPih6Xp9NuEWW` | `765d2ba906dbc32ca17cc11f5310a89e9ee1f6420508c63861f2f8ba4ee34bb2` |
+| INJ/USD     | `GwXYEfmPdgHcowF9GZwbb1WiTGTn1fuT3hbSLneoBKK6` | `7a5bc1d2b56ad029048cd63964b3ad2776eadf812edc1a43a31406cb54bff592` |
 
 ## Sui