add error messages for LiquidityOracleError

Author: Anirudh Suresh

pyth-sdk/src/error.rs

@@ -0,0 +1,12 @@
+use solana_program::program_error::ProgramError;
+use thiserror::Error;
+
+#[derive(Error, Debug, Copy, Clone)]
+pub enum LiquidityOracleError {
+    #[error("deposits exceeds max depositable")]
+    ExceedsMaxDeposits,
+    #[error("initial discount rate should not be greater than final discount rate")]
+    InitialDiscountExceedsFinalDiscount,
+    #[error("final discount rate should not be greater than the discount precision")]
+    FinalDiscountExceedsPrecision,
+}