add readme

README.md

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+# IGA (Insecure Garbling Algorithm)
+- A hashing like algorithm that can be used to verify the integrity of a file.
+## Example usage
+```ts
+import IGA from './IGA'
+
+let hash = IGA.hash("test")
+console.log(hash)
+console.log(IGA.verifyHash("test", hash))
+```
+## Functions
+- `hash(input: string, salt: number = 0, iterations: number = 32, len: number = 32, seed?: number): string` - creates a "hash" from the input
+- `verifyHash(input: string, inHash: string, salt: number = 0, iterations: number = 32, len: number = 32): verifyOut` - verifies the "hash", returns `{ valid: bool, reason: string }`
+## DO NOT USE FOR SECURE PROJECTS
+- It's security has not been verified yet.
+- It can't be reverted but it might collide.