chore: update readme doc for mainstay

doc/MAINSTAY.md

@@ -0,0 +1,21 @@
+# Mainstay integration
+
+All events undergo hash conversion, leading to the creation of a cumulative hash. This cumulative hash is then forwarded for commitment to the Mainstay proof-of-publication service for attestation.
+
+The Mainstay service can be accessed through an HTTP interface or via a SOCKS5 Tor proxy. The service is operational and backed by a valid token_id for verification purposes. Funding, conducted through an LN payment, is executed in advance and separately from the subscription process (i.e., the token_id has already been processed). Mainstay proofs are stored and accessible, but the verification against bitcoind and staychain is conducted independently.
+
+## Configuration
+
+The node is configured with essential parameters, including the Mainstay server URL, slot index (position), authentication token, base public key, and chain code:
+
+```
+pub struct Mainstay {
+    pub url: String,
+    pub position: i32,
+    pub token: String,
+    pub base_pubkey: String,
+    pub chain_code: String,
+}
+```
+
+This can be added to `/src/config.rs`

doc/MANUAL.md

@@ -21,6 +21,7 @@ The sample can send the following requests to the relay:
 - `opensubscription subscriptionid kinds since until`: open a subscription to the relay
 - `closesubscription subscriptionid`: close a subscription to the relay
 - `submitcredentialproof merkle_block`: submit a staking credential proof to the relay
+- `verifyinclusionproof`: verify the inclusion proof
 
 The `civkit-cli` can send the following commands to the relay:
 - `ping`: send a ping message