feat: full CLI and API for dash message signing and verification

Author: AJ ONeal

README.md

@@ -3,22 +3,70 @@
 Sign and Verify messages with Dash Private Keys
 
 ```bash
-git clone https://github.com/dashhive/dashmsg
-pushd ./dashmsg/
+dashmsg sign \
+    'XK5DHnAiSj6HQNsNcDkawd9qdp8UFMdYftdVZFuRreTMJtbJhk8i' \
+    'dte2022-akerdemelidis|estoever|mmason'
 ```
 
 ```bash
-go build -mod=vendor -o dashmsg ./cmd/dashmsg/
+dashmsg verify \
+    'Xn4A2vv5fb7LvmiiXPPMexYbSbiQ29rzDu' \
+    'dte2022-akerdemelidis|estoever|mmason' \
+    'H2Opy9NX72iPZRcDVEHrFn2qmVwWMgc+DKILdVxl1yfmcL2qcpu9esw9wcD7RH0/dJHnIISe5j39EYahorWQM7I='
 ```
 
-```bash
-my_privkey='XK5DHnAiSj6HQNsNcDkawd9qdp8UFMdYftdVZFuRreTMJtbJhk8i'
+Also useful for and inspecting debugging:
 
-my_msg='dte2022-afrancis|ctafti'
+-   coin type (network) byte
+-   payment address of private key
+-   i (quadrant), r, and s of signature
 
-./dashmsg sign "${my_privkey}" "${my_msg}"
+## Usage
+
+```bash
+dashmsg help
 ```
 
 ```txt
-IIm+2++GxT4OtTTY4aZK0iKIWh21yxiwomfY76l197qtVB42KVpy53QxS65zq1R9eN2XLcGh2YsedsVtsmrw2OE=
+dashmsg v0.9.0 (gxxxxxx) 2022-03-12T01:33:52-0700
+
+Usage
+ dashmsg <command> [flags] args...
+
+See usage: dashmsg help <command>
+
+Commands:
+    version
+    gen [name.wif]
+    sign <key> <msg>
+    inspect <key | address | signature>
+    decode (alias of inspect)
+    verify <payment address> <msg> <signature>
+
+Examples:
+    dashmsg gen ./dash.wif
+
+    dashmsg sign dash.wif ./msg.txt
+    dashmsg sign dash.wif 'my message'
+    dashmsg sign 'Xxxx...ccc' 'my message'
+
+    dashmsg inspect --verbose 'Xxxxxxxxxxxxxxxxxxxxxxxxxxxxcccccc'
+
+    dashmsg verify Xxxx...ccc 'my message' 'II....signature...'
+    dashmsg verify ./addr.b58c.txt ./msg.txt ./sig.b64.txt
 ```
+
+## How to Build
+
+```bash
+git clone https://github.com/dashhive/dashmsg
+pushd ./dashmsg/
+```
+
+```bash
+go build -mod=vendor -o dashmsg ./cmd/dashmsg/
+```
+
+## Go Library
+
+Documentation at <https://pkg.go.dev/github.com/dashhive/dashmsg>.