Added how it works + feature + program ixns description

Author: Shiva953

README.md

@@ -1,14 +1,41 @@
 ## OpenVest
-### Vested Token Allocations for Employees
+Openvest allows you to create vested token allocations for company employees. A company can create its on-chain treasury account, and use that to create vested token allocations for its employees. 
 
 ## Features
-1. Create Vesting Account for the Company
-2. Choose the start time, end time, cliff period and create vesting schedule for given employee
-3. Employee can claim some % the token allocation after cliff ends, full allocation is unlocked at end time.
+- Create Treasury Account for the Company, with desired token and amount of tokens to lock in treasury
+- Use the Company Account to create vested token allocations for its employees
+- Company Owner can choose `start date & time`, `end time`, `cliff period(the duration for which tokens are locked)` and the `beneficiary(employee)`
+- Employee can `claim` their allocation after the cliff period ends with entire allocation claimable only during the `end time`
 
 ## How it works
-Linear Vesting Schedule is followed, upon employee vesting account creation, tokens are locked in the treasury and can be claimed by the employee only after the cliff ends
+A Linear Vesting Schedule is followed.
+OpenVest implements a linear vesting schedule that provides a fair and gradual token allocation mechanism. 
 
-At CLIFF: (C - S)/(E - S)% of total allocation
-At ENDTIME: 100% OF TOTAL ALLOCATION
+
+Let:
+
+- `A = Total token allocation`
+- `S = Start time`
+- `C = Cliff time(Start time + Cliff Period)`
+- `E = End time`
+- `T = Current time`
+
+The vesting calculation follows this formula:
+- Amount of tokens claimable at time T = `min(A * (T - S) / (E - S), A)`
+  
+Where:
+
+1. If `T < S`: 0 tokens vested (pre-vesting period)
+2. If `S ≤ T < C`: 0 tokens vested (cliff period)
+3. If `C ≤ T ≤ E`: Proportional tokens vested(Amount = `A * (T - S) / (E - S)`)
+4. If `T = E`: Full allocation vested(`Full Amount = A` is unlocked)
+
+## Program Implementation
+The core functionality is implemented in Rust using the Anchor framework:
+
+- `create_vesting_account`: Creates the company vesting account along with the associated treasury account(which would contain the total amount of tokens)
+  
+- `create_employee_vesting`: Creates the employee vesting account with given `start time`, `end time`, and `cliff` and `beneficiary`, along with `employee allocation`
+
+- `claim_tokens`: Allows the employee to claim his allocation after the cliff period, by transfering some % of employee allocation amount of tokens from the treasury account to the employee