Update documents

Author: haeter525

docs/source/install.rst

@@ -31,8 +31,8 @@ Once you see the following msg, then you're all set::
       -o, --output FILE               Output report in JSON
       -a, --apk FILE                  APK file  [required]
       -r, --rule PATH                 Rules directory  [default:
-                                      /Users/$USER/.quark-engine/quark-rules]
-      -g, --graph                     Create call graph to call_graph_image
+                                      /home/haeter/.quark-engine/quark-rules]
+      -g, --graph [png|json]          Create call graph to call_graph_image
                                       directory
       -c, --classification            Show rules classification
       -t, --threshold [100|80|60|40|20]
@@ -46,9 +46,14 @@ Once you see the following msg, then you're all set::
       --core-library [androguard|rizin]
                                       Specify the core library used to analyze an
                                       APK
-      --multi-process INTEGER RANGE   Allow analyzing APK with N processes, 
-                                      where N doesn't exceeds the number of usable CPUs - 1 
-                                      to avoid memory exhaustion.
+      --multi-process INTEGER RANGE   Allow analyzing APK with N processes, where
+                                      N doesn't exceeds the number of usable CPUs
+                                      - 1 to avoid memory exhaustion.  [x>=1]
+      --rizin-path FILE               Specify a Rizin executable for Quark to
+                                      perform analyses.
+      --disable-rizin-installation    Don't install Rizin automatically when no
+                                      Rizin instance with a compatible version is
+                                      found.
       --version                       Show the version and exit.
       --help                          Show this message and exit.
 

docs/source/testing.rst

@@ -15,6 +15,29 @@ Then we could test one of the apk in `apk-malware-samples` by the rules `quark-r
 
     $ quark -a Ahmyth.apk -s
 
+Running analyses based on Rizin
+==================
+
+Now Quark also supports `Rizin`_ as one of our Android analysis frameworks. You can use option ``--core-library`` with ``rizin`` to enable the Rizin-based analysis library.
+
+.. _`Rizin`: https://github.com/rizinorg/rizin
+
+.. code-block:: bash
+
+    quark -a Ahmyth.apk -s --core-library rizin
+
+
+For now, Quark is compatible with Rizin v0.4.0. But, users don't have to installed a Rizin with that version. Quark provides a feature to automatically setup a independent Rizin. In this way, the dependency will not conflict with your environment. Type in the above command and let Quark handle everything else for you.
+
+If there is a working installation of Rizin installed in the system, Quark will check its version to determine if it is compatible. If true, Quark automatically uses it for the analysis. Otherwise, Quark uses the independent Rizin installed in the Quark directory (``~/.quark-engine``).
+
+You can use option ``--rizin-path`` to specify the path of the Rizin executable.
+
+.. code-block:: bash
+
+    quark -a Ahmyth.apk -s --core-library rizin --rizin-path path_to_a_rizin_executable
+
+Moreover, if you don't want Quark to install an independent Rizin, you can use the flag ``--disable-rizin-installation`` to disable this feature.
 
 Running in Docker
 =================