Document feature flags (#558)

* Document feature flags

* Fix taplo issue

* Mention examples in the feature flag documentation.

Cargo.toml

@@ -70,6 +70,25 @@ disable_target_static_assertions = [
 ]
 # If this is active all the code compiles in synchronous mode. Otherwise `async` is supported.
 sync-api = ["ac-compose-macros/sync-api", "maybe-async/is_sync"]
+# Use the `jsonrpsee` crate for websocket communication. Does provide sync and async support but needs a tokio runtime.
+# Provides convenience functions such as subscription callbacks.
+# Most examples use the `jsonrpsee` feature and can be used for reference.
+jsonrpsee-client = ["std", "jsonrpsee", "futures"]
+# Use the `tungstenite` crate for websocket communication. No async support but has some reconnection capabilities.
+# See the example `transfer_with_tungstenite_client` on how to use it.
+tungstenite-client = ["std", "tungstenite"]
+# Use the `ws` crate for websocket communication. No async support.
+# Establishes a new connection for each request and therefore is limited in terms of performance.
+# See the example `transfer_with_ws_client` on how to use it.
+ws-client = ["std", "ws"]
+# Enables functionality that helps to create extrinsics for `pallet-staking`.
+# See the `StakingExtrinsics` trait and the `staking_batch_payout` example to get an understanding
+# of the functionality this feature provides
+staking-xt = ["std", "ac-primitives/staking-xt"]
+# Enables functionality that helps to create extrinsics for `pallet-contracts`.
+# See the `ContractsExtrinsics` trait and the `contract_instantiate_with_code` example to get an understanding
+# of the functionality this feature provides.
+contracts-xt = ["std", "ac-primitives/contracts-xt"]
 std = [
     # crates.io no_std
     "codec/std",
@@ -91,11 +110,3 @@ std = [
     "ac-node-api/std",
     "ac-primitives/std",
 ]
-# Use the `jsonrpsee` crate for websocket communication. Does provide sync and async support.
-jsonrpsee-client = ["std", "jsonrpsee", "futures"]
-# Use the `tungstenite` crate for websocket communication. No async support.
-tungstenite-client = ["std", "tungstenite"]
-# Use the `ws` crate for websocket communication. No async support.
-ws-client = ["std", "ws"]
-staking-xt = ["std", "ac-primitives/staking-xt"]
-contracts-xt = ["std", "ac-primitives/contracts-xt"]