feat(SOLNENG-27): initial commit

Author: MnrGreg

.gitignore

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+*.crt
+*.key
+.vscode

README.md

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+
+## Sample go staking app demo
+
+
+```mermaid
+sequenceDiagram
+    autonumber
+    participant StakeClient as Sample stake<br> client application
+    participant StakeAPI as Stake Intent API
+    participant Blockchain as Blockchain
+    participant TSM as Sender Wallet Vault<br>(private key)
+
+    StakeClient ->> StakeAPI: get StakeIntent unsigned tx data <br>(amount, withdrawal & recipient address)
+    StakeClient ->> Blockchain: get blockchain inputs for new tx<br>(gas fee, chainID, sender wallet nonce)
+    StakeClient ->> StakeClient: construct unsigned tx
+    StakeClient ->> TSM: request signature of unsigned tx
+    TSM -->> StakeClient: return tx signature
+    StakeClient ->> Blockchain: broadcast signed tx<br>(signed tx, deposit contract)
+```
+
+
+<!--
+ - ToDo:
+     - use AWS Builder Vault environment (remove all code needed for mTLS with BDApp Builder Vault)
+
+# Get Plans
+http -b GET https://svc.blockdaemon.com/boss/v1/plans?protocols=ethereum&networks=holesky \
+  X-API-KEY:$XAPIKEY \
+  X-Client-ID:demo-organization
+
+# Post Intent
+http -b POST https://svc.blockdaemon.com/boss/v1/ethereum/holesky/stake-intents \
+  X-API-KEY:$XAPIKEY \
+  accept:application/json \
+  content-type:application/json \
+  stakes:='[{"amount":"32000000000","withdrawal_address":"0x00000000219ab540356cBB839Cbe05303d7705Fa","fee_recipient":"0x93247f2209abcacf57b75a51dafae777f9dd38bc"}]'
+
+# Get Intents
+http GET https://svc.blockdaemon.com/boss/v1/stake-intents?protocols=ethereum&networks=holesky \
+  X-API-KEY:$XAPIKEY 
+```
+--!>

go.mod

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+module samplestakedemo
+
+go 1.21.0
+
+require (
+	github.com/ethereum/go-ethereum v1.13.14
+	gitlab.com/Blockdaemon/go-tsm-sdkv2 v0.0.0-20240227205306-65d60d978f8d
+	golang.org/x/sync v0.6.0
+)
+
+require (
+	filippo.io/edwards25519 v1.1.0 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/StackExchange/wmi v1.2.1 // indirect
+	github.com/bits-and-blooms/bitset v1.10.0 // indirect
+	github.com/btcsuite/btcd/btcec/v2 v2.2.0 // indirect
+	github.com/consensys/bavard v0.1.13 // indirect
+	github.com/consensys/gnark-crypto v0.12.1 // indirect
+	github.com/crate-crypto/go-kzg-4844 v0.7.0 // indirect
+	github.com/deckarep/golang-set/v2 v2.1.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
+	github.com/ethereum/c-kzg-4844 v0.4.0 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/holiman/uint256 v1.2.4 // indirect
+	github.com/mmcloughlin/addchain v0.4.0 // indirect
+	github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible // indirect
+	github.com/supranational/blst v0.3.11 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	golang.org/x/crypto v0.20.0 // indirect
+	golang.org/x/exp v0.0.0-20231110203233-9a3e6036ecaa // indirect
+	golang.org/x/mod v0.14.0 // indirect
+	golang.org/x/sys v0.17.0 // indirect
+	golang.org/x/tools v0.15.0 // indirect
+	rsc.io/tmplfunc v0.0.3 // indirect
+)