Add usage and building

sdbg/README.md

@@ -6,3 +6,40 @@ Right now, it's only an experiment, so if you have feature suggestions, feel fre
 
 Since sdbg is powered by SmaliVM, it has all of its strengths and weaknesses. It can handle unknown values and parameters by taking every execution path, which is cool. But it's also possible to get stuck in infinite loops and debugging multiple execution paths is tricky.
 
+## Building
+
+From the root of this repository:
+
+```bash
+./gradlew :sdbg:fatjar
+```
+
+The full jar will be in `sdbg/build/libs/`.
+
+## Usage
+
+```plaintext
+Usage: <main class> [-hVv] input-path method-signature
+Smali DeBuGger (SDBG)
+      input-path         Input directory containing Smali
+      method-signature   Method signature to execute
+  -h, --help             Show this help message and exit.
+  -v, --verbose          Specify multiple -v options to increase verbosity.
+                         For example, `-v -v -v` or `-vvv`
+  -V, --version          Print version information and exit.
+```
+
+```plaintext
+Commands:
+  help         Displays help information about the specified command
+  cls, clear   Clears the screen
+  list, l      List source code
+  where, w     Shows current instruction index and which function you are in
+  step, s      Step to next line of code including stepping into methods
+  next, n      Execute next line of code without entering methods
+  info, i      List information about target
+  print, p     Print value stored in variable or field
+  break, b     Suspend program at specified function, instruction index, or
+                 index offset
+  continue, c  Continue executing until next break point
+```