docs: architectural Diagram (#161)

* adding documentation for rpc.md

* adding rpc methods in table for rpc.md

* adjusting readme to link to rpc.md

* fixing grammar

* grammar

* adding RPC Methods according to documentation and listing column as Client Function

* adding more description space

* undoing description spacing

* adding get block transaction count by hash to node.rs and rpc.rs

* functioning getblocktransactioncountbyhash function

* removing documentation

* adding second rpc method and simplifying logic

* adjusting example and node.rs

* formatting

* fixing clippy errors

* adding to client and to rpc.md

* formatting

* integrating into client

* u64 return types, rpc.md updated to get_nonce, get_transaction_count -> get_nonce revert

* cargo fmt

* readme architecture init

* removing blockchain

* removing complexity

* updating mermaid with links from evm -> execution, renaming, and recoloring

* coloring letters black

* removing uncessary styling and adding untrustedexecutionrpc and untrustedconsensusrpc

README.md

@@ -146,6 +146,43 @@ async fn main() -> Result<()> {
 }
 ```
 
+## Architecture
+```mermaid
+graph LR
+
+Client ----> Rpc
+Client ----> Node
+Node ----> ConsensusClient
+Node ----> ExecutionClient
+ExecutionClient ----> ExecutionRpc
+ConsensusClient ----> ConsensusRpc
+Node ----> Evm
+Evm ----> ExecutionClient
+ExecutionRpc --> UntrustedExecutionRpc
+ConsensusRpc --> UntrustedConsensusRpc
+
+classDef node fill:#f9f,stroke:#333,stroke-width:4px, color:black;
+class Node,Client node
+classDef execution fill:#f0f,stroke:#333,stroke-width:4px;
+class ExecutionClient,ExecutionRpc execution
+classDef consensus fill:#ff0,stroke:#333,stroke-width:4px;
+class ConsensusClient,ConsensusRpc consensus
+classDef evm fill:#0ff,stroke:#333,stroke-width:4px;
+class Evm evm
+classDef providerC fill:#ffc
+class UntrustedConsensusRpc providerC
+classDef providerE fill:#fbf
+class UntrustedExecutionRpc providerE
+classDef rpc fill:#e10
+class Rpc rpc
+
+
+subgraph "External Network"
+UntrustedExecutionRpc
+UntrustedConsensusRpc
+end
+```
+
 ## Benchmarks
 
 Benchmarks are defined in the [benches](./benches/) subdirectory. They are built using the [criterion](https://github.com/bheisler/criterion.rs) statistics-driven benchmarking library.