add qr formats doc

docs/qr_formats.md

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+# QR Formats
+
+### Scanning QR Codes
+
+SeedSigner supports scanning the following QR formats
+
+Animated QR Formats:
+- PSBT
+    - Blockchain Commons [UR2 PSBT](https://github.com/BlockchainCommons/Research/blob/master/papers/bcr-2020-006-urtypes.md)
+    - Specter Desktop base64 segments animated
+    - [Legacy UR](https://github.com/BlockchainCommons/Research/blob/d4d72417a1ff18f9422371b2f71bf2652adce41c/papers/bcr-2020-005-ur.md) Format that should no longer be used
+
+Static QR Formats:
+- PSBT
+    - Base64 (if the PSBT byte size is too large, SS may have trouble scanning)
+- Seed
+    - SeedSigner Seed QR format
+        - A 48 or 96 length string of numbers representing a bip39 wordlist (all wordlist languages supported). The numeric sequence is a concatination of four-digit zero padded segments. Each four-digit segment represents a bip39 word expressed by a zero-indexed position in the wordlist. For example "0000" is abandon in the english bip39 wordlist.
+	- English Bip39 Mnemonic words separated by a space. Currently only supports 12 and 24 word seeds.
+	- English Bip39 Mnemonic with only first 4 letters seperated by a space. Currently only supports 12 and 24 word seeds.
+
+### Displaying QR Codes
+
+SeedSigner supports displaying QR's in the following formats
+
+Animated QR Formats:
+- PSBT
+    - Blockchain Commons [UR2 PSBT](https://github.com/BlockchainCommons/Research/blob/master/papers/bcr-2020-006-urtypes.md)
+	- Specter Desktop base64 segments animated
+
+Static QR Formats:
+- Seed
+    - SeedSigner Seed QR format
+        - A 48 or 96 length string of numbers representing a bip39 wordlist (all wordlist languages supported). The numeric sequence is a concatination of four-digit zero padded segments. Each four-digit segment represents a bip39 word expressed by a zero-indexed position in the wordlist. For example "0000" is abandon in the english bip39 wordlist.

docs/recovery.md

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+# SeedSigner Recovery Information
+
+SeedSigner creates extended public keys for the coordinator following [slip-0132](https://github.com/satoshilabs/slips/blob/master/slip-0132.md) to encode the extended public key. SeedSigner only supports native segwit for single sig (P2WPKH) and native segwit multisig (P2WSH).
+
+SeedSigners default settings for "Script Policy" (2021-08-21) is Multi Sig Native Segwit. The second option is Single Sig Native Segwit.
+
+- Single Sig Derivation Path: m/48'/0'/0'/2'
+- Single Sig Public Key Encoding: 0x04b24746 - zpub
+- Multisig Dervivation Path: m/84'/0'/0'
+- Multisig Public Key Encoding: 0x02aa7ed3 - Zpub
+
+Changing the network settings from main to test will change the public key encoding and derivation path following bip-0084, bip-0048 and slip-0132 standards.
+
+Custom derivation paths will be optional in the future.