initial addition of essential crypto, encoders, workflows and LLM instructions

pkg/crypto/ec/doc.go

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+// Copyright (c) 2013-2014 The btcsuite developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+// Package btcec implements support for the elliptic curves needed for bitcoin.
+//
+// Bitcoin uses elliptic curve cryptography using koblitz curves
+// (specifically secp256k1) for cryptographic functions.  See
+// http://www.secg.org/collateral/sec2_final.pdf for details on the
+// standard.
+//
+// This package provides the data structures and functions implementing the
+// crypto/elliptic Curve interface in order to permit using these curves
+// with the standard crypto/ecdsa package provided with go. Helper
+// functionality is provided to parse signatures and public keys from
+// standard formats.  It was designed for use with btcd, but should be
+// general enough for other uses of elliptic curve crypto.  It was originally based
+// on some initial work by ThePiachu, but has significantly diverged since then.
+package btcec