add how to register custom ICQ contract

contracts/docs/interchainqueries/howto/register_custom_kv_icq/.cargo/config

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+[alias]
+wasm = "build --release --target wasm32-unknown-unknown"
+wasm-debug = "build --target wasm32-unknown-unknown"
+unit-test = "test --lib"
+integration-test = "test --test integration"
+schema = "run --example contracts/docs/interchainqueries/howto/register_kv_icq-schema"

contracts/docs/interchainqueries/howto/register_custom_kv_icq/Cargo.toml

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+[package]
+name = "howto_register_custom_kv_icq"
+version = "0.1.0"
+edition = "2021"
+
+exclude = [
+  # Those files are rust-optimizer artifacts. You might want to commit them for convenience but they should not be part of the source code publication.
+  "contract.wasm",
+  "hash.txt",
+]
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+library = []
+
+[dependencies]
+cosmwasm-std = { workspace = true, features = ["stargate", "staking"] }
+cw2 = { workspace = true }
+schemars = { workspace = true }
+serde = { workspace = true }
+neutron-sdk = { workspace = true }
+neutron-std = { workspace = true }
+cosmos-sdk-proto = { workspace = true }
+cw-storage-plus = { workspace = true }
+prost = { workspace = true }
+serde-json-wasm = { workspace = true }
+
+[dev-dependencies]
+base64 = { workspace = true }
+cosmwasm-schema = { workspace = true }

contracts/docs/interchainqueries/howto/register_custom_kv_icq/Makefile

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+# Validators Registry
+
+CURRENT_DIR = $(shell pwd)
+CURRENT_DIR_RELATIVE = $(notdir $(shell pwd))
+
+clippy:
+	rustup component add clippy || true
+	cargo clippy --all-targets --all-features --workspace -- -D warnings
+
+test: clippy
+	cargo unit-test

contracts/docs/interchainqueries/howto/register_custom_kv_icq/README.md

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+# HowTo register a KV Interchain Query with custom keys contract
+
+A simple contract that implements the flow described in the [How to register an Interchain Query using neutron-sdk](https://docs.neutron.org/neutron/modules/interchain-queries/how-to#how-to-register-a-kv-interchain-query-with-custom-keys) documentation section.

contracts/docs/interchainqueries/howto/register_custom_kv_icq/examples/neutron_interchain_queries-schema.rs

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+// Copyright 2022 Neutron
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use std::env::current_dir;
+use std::fs::create_dir_all;
+
+use cosmwasm_schema::{export_schema, remove_schemas, schema_for};
+use howto_register_custom_kv_icq::msg::{ExecuteMsg, InstantiateMsg, QueryMsg};
+
+fn main() {
+    let mut out_dir = current_dir().unwrap();
+    out_dir.push("schema");
+    create_dir_all(&out_dir).unwrap();
+    remove_schemas(&out_dir).unwrap();
+
+    export_schema(&schema_for!(InstantiateMsg), &out_dir);
+    export_schema(&schema_for!(ExecuteMsg), &out_dir);
+    export_schema(&schema_for!(QueryMsg), &out_dir);
+}