Added forensics section

tools/dff.md

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+# dff
+
+Notes
+-------
+Digital Forensics Framework dff is a simple but powerful open source tool with a flexible module system which will help you in your digital forensics works, including files recovery due to error or crash, evidence  research and analysis, etc. The source code is written in C++ and Python, allowing performances and great extensibility.
+
+Help Text
+-------
+```
+DFF
+Digital Forensic Framework
+
+Usage: /usr/bin/dff [options]
+Options:
+  -v      --version                  display current version
+  -g      --graphical                launch graphical interface
+  -b      --batch=FILENAME	     executes batch contained in FILENAME
+  -l      --language=LANG            use LANG as interface language
+  -h      --help                     display this help message
+  -d      --debug                    redirect IO to system console
+          --verbosity=LEVEL          set verbosity level when debugging [0-3]
+  -c      --config=FILEPATH          use config file from FILEPATH
+
+```
+
+Example Usage
+-------
+
+Links
+-------
+