Add SIP number to SIP remote metadata

Move the proposal to directory sip-0001-remote-metadata.
Add the table with SIPs and the link to the SIP to sips/README.md.

doc/sips/README.md

@@ -3,3 +3,10 @@ People wishing to submit Sia Improvement Proposals (SIPs) should first propose t
 Having a SIP here does not make it a formally accepted standard until its status becomes Final or Active.
 
 Those proposing changes should consider that ultimately consent may rest with the consensus of the Sia users.
+
+| Number  | Layer   | Title                   | Owner     | Status  |
+| :-----: | :-----: | :---------------------: | :-------: | :-----: |
+| [1][1]  | renter  | Store renter metadata remotely | [@starius][starius] | draft |
+
+[1]: sip-0001-remote-metadata
+[starius]: https://github.com/starius

doc/sips/remote-metadata/README.md → doc/sips/sip-0001-remote-metadata/README.md

@@ -1,4 +1,4 @@
-# Store renter metadata remotely
+# SIP 1. Store renter metadata remotely
 
 Status: **draft**.