Add HIP number and link to discussion

Signed-off-by: Stoyan Panayotov <stoyan.panayotov@limechain.tech>

Author: stoqnkpL

HIP/hip-xxx.md HIP/hip-1415.mdHIP/hip-xxx.md renamed to HIP/hip-1415.md

@@ -1,5 +1,5 @@
 ---
-hip: <TBD>
+hip: 1415
 title: Configurable Native Coin Decimal Precision
 author: Stoyan Panayotov <@stoqnkpL>
 requested-by: 
@@ -10,7 +10,7 @@ needs-hedera-review: Yes
 status: Draft
 created: 2026-03-04
 updated: 2026-03-04
-discussions-to: https://github.com/hiero-ledger/hiero-improvement-proposals/discussions/<TBD>
+discussions-to: https://github.com/hiero-ledger/hiero-improvement-proposals/discussions/1416
 ---
 
 ## Abstract