Update readme

README.md

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-# subxt · ![build](https://github.com/paritytech/subxt/workflows/Rust/badge.svg) [![Latest Version](https://img.shields.io/crates/v/subxt.svg)](https://crates.io/crates/subxt) [![Documentation](https://docs.rs/subxt/badge.svg)](https://docs.rs/subxt)
+# subxt 
+
+## Placeholder awaiting release: renamed from https://crates.io/crates/substrate-subxt
 
 A library to **sub**mit e**xt**rinsics to a [substrate](https://github.com/paritytech/substrate) node via RPC.
-
-### :warning: Health Warning :warning: considered *alpha* after recent changes, API still subject to change
-
-#### See https://github.com/paritytech/subxt/issues/309 for an overview of outstanding issues.
-
-## Usage
-
-See [examples](./examples).
-
-## Integration Testing
-
-Most tests require a running substrate node to communicate with. This is done by spawning an instance of the
-substrate node per test. It requires an executable binary `substrate` at [`polkadot-v0.9.10`](https://github.com/paritytech/substrate/releases/tag/polkadot-v0.9.10) on your path.
-
-This can be installed from source via cargo:
-
-```bash
-cargo install --git https://github.com/paritytech/substrate node-cli --tag=polkadot-v0.9.10 --force
-```
-
-**Alternatives**
-
-[substrate-api-client](https://github.com/scs/substrate-api-client) provides similar functionality.
-
-## Subxt Client
-By default the client builder will connect to a full node via rpc. The `subxt-client` helps
-embedding a light client directly. It can also be used to embed a full node. This is especially
-useful for testing and ci.
-
-#### License
-
-<sup>
-The entire code within this repository is licensed under the <a href="LICENSE">GPLv3</a>.
-Please <a href="https://www.parity.io/contact/">contact us</a> if you have questions about the licensing of our
- products.
-</sup>