feat: stacking lib readme

packages/stacking/README.md

@@ -1,8 +1,94 @@
 # @stacks/stacking [![npm](https://img.shields.io/npm/v/@stacks/stacking?color=red)](https://www.npmjs.com/package/@stacks/stacking)
-Library for easy Stacking.
+Library for PoX Stacking.
 
 ## Installation
 
 ```
 npm install @stacks/stacking
 ```
+
+## Initialization
+```typescript
+const { StacksTestnet } = require('@stacks/network');
+const { Stacker } = require('@stacks/stacking');
+
+const address = 'ST3XKKN4RPV69NN1PHFDNX3TYKXT7XPC4N8KC1ARH';
+const network = new StacksTestnet();
+const stacker = new Stacker(address, network);
+```
+
+## Check stacking eligibility
+
+```typescript  
+const stackingEligibility = await stacker.canLockStx({poxAddress, cycles});
+
+// stackingEligibility:
+// {
+//   eligible: false,
+//   reason: 'ERR_STACKING_INVALID_LOCK_PERIOD',
+// }
+```
+
+## Get PoX info
+```typescript
+const poxInfo = await stacker.getPoxInfo();
+
+// poxInfo:
+// {
+//   contract_id: 'ST000000000000000000002AMW42H.pox',
+//   first_burnchain_block_height: 0,
+//   min_amount_ustx: 83335083333333,
+//   prepare_cycle_length: 30,
+//   rejection_fraction: 3333333333333333,
+//   reward_cycle_id: 17,
+//   reward_cycle_length: 120,
+//   rejection_votes_left_required: 0,
+//   total_liquid_supply_ustx: 40000840000000000
+// }
+```
+
+## Get account balance
+```typescript
+const responseBalanceInfo = await stacker.getAccountBalance();
+
+// 800000000000 
+```
+
+## Stack STX
+```typescript
+const poxAddress = '1Xik14zRm29UsyS6DjhYg4iZeZqsDa8D3';
+const amountMicroStx = new BN(100000000000);
+const cycles = 10;
+const key = 'd48f215481c16cbe6426f8e557df9b78895661971d71735126545abddcd5377001';
+const burnBlockHeight = 2000;
+
+const stackingResults = await stacker.lockStx({ 
+  amountMicroStx,
+  poxAddress,
+  cycles,
+  key,
+  burnBlockHeight
+});
+
+// stackingResults:
+// {
+//   txid: '0xf6e9dbf6a26c1b73a14738606cb2232375d1b440246e6bbc14a45b3a66618481',
+//   transaction: 'https://testnet-explorer.now.sh/txid/0xf6e9dbf6a26c1b73a14738606cb2232375d1b440246e6bbc14a45b3a66618481'
+// }
+```
+
+## Get account stacking status
+```typescript
+const stackingStatus = await stacker.getStatus();
+
+// stackingStatus:
+// {
+//   amount_microstx: '80000000000000',
+//   first_reward_cycle: 18,
+//   lock_period: 10,
+//   pox_address: {
+//     version: '00',
+//     hashbytes: '05cf52a44bf3e6829b4f8c221cc675355bf83b7d'
+//   }
+// }
+```