Update polkavm docs

Author: dedok

docs/PolkaVM/PolkaVMv2.drawio.png

@@ -1,7 +1,8 @@
 # PolkaVM Pallet
 
-This document describe: key features of PolkaVM v2 - v3 pallet.
-High level design could be found at `docs/PolkaVM/PolkaVMv2.drawio`.
+This document describe: key features of PolkaVM v2.
+[High level design](https://github.com/QuantumFusion-network/spec/blob/main/docs/PolkaVM/PolkaVMv2.drawio).
+![alt text](docs/PolkaVM/PolkaVMv2.drawio.png)
 
 Polka VM Pallet has two type of extrinsic: uploading PolkaVM compiled blob and execute it via given address.
 Both extrinsics are avaliable via Substrate RPC.
@@ -18,63 +19,15 @@ could be found in `Polka VM Blob hashing & addressing`. In short word: smart con
 - Smart contracts execution support GAS (more details in `GAS` section).
 
 ## PolkaVM Blob hashing & addressing
-Desing could be found at `docs/PolkaVM/blob_hashing_addressing.md`.
+[Desing](https://github.com/QuantumFusion-network/spec/blob/main/docs/PolkaVM/blob_hashing_addressing.md)
 
 ## GAS
-PolkaVM pallet supports GAS using PolkaVM feature
-(https://github.com/paritytech/polkavm) for current integration of PolkaVM into Substrate.
-Team planing to improve this solution in the future.
-
-## Functions
+PolkaVM pallet supports GAS using [PolkaVM gas](https://github.com/paritytech/polkavm).
 
+## Storage
+[Design](https://github.com/QuantumFusion-network/spec/blob/main/docs/PolkaVM/smart_contract_storage.md) and [example](https://github.com/QuantumFusion-network/qf-polkavm-sdk/blob/main/examples/example-smart-contract/src/main.rs).
+[Modeling](https://github.com/QuantumFusion-network/spec/blob/main/docs/PolkaVM/qfPolkaVM-X_O_game_modeling.md) of the X|O game by using [qf-polkavm-sdk](https://github.com/QuantumFusion-network/qf-polkavm-sdk/tree/main) and [storage api](https://github.com/QuantumFusion-network/qf-polkavm-sdk/blob/main/src/lib.rs#L145).
 
 ## QF Framework for Smart Contracts PolkaVM v2
-
-The first implementation of the QF Framework is too low level, team understand it. It was done for testing integration of two runtimes.
-Here is an example of Smart contract code:
-
-```rust
-#![no_std]
-#![no_main]
-
-#[panic_handler]
-fn panic(_info: &core::panic::PanicInfo) -> ! {
-    unsafe {
-        core::arch::asm!("unimp", options(noreturn));
-    }
-}
-
-#[polkavm_derive::polkavm_import]
-extern "C" {
-    fn balance() -> u64;
-    fn print() -> u64;
-    fn transfer(address_idx: u32, balance_idx: u32) -> u64;
-}
-
-#[polkavm_derive::polkavm_export]
-extern "C" fn call_balance() -> u64 {
-    unsafe { balance() }
-}
-
-#[polkavm_derive::polkavm_export]
-extern "C" fn call_print() -> u64 {
-    unsafe { print() }
-}
-
-#[polkavm_derive::polkavm_export]
-extern "C" fn call_transfer() -> u64 {
-    unsafe { transfer(0, 0) }
-}
-```
-
-Supported functions:
-- transfer(A, b): trasfering tokens,
-- balance(): get balance info,
-- print(): for logging.
-
-All of this avaliable in QF DevNet (http://dev.qfnetwork.xyz).
-
-## QF Framework for Smart Contracts PolkaVM v3
-
-Planned that next version includes the next features: `https://github.com/QuantumFusion-network/spec/issues/9`.
+Please find example of the contract [here](https://github.com/QuantumFusion-network/qf-polkavm-sdk/blob/main/examples/example-smart-contract/src/main.rs). For getting starting also please read [readme](https://github.com/QuantumFusion-network/qf-polkavm-sdk/blob/main/README.md).