Update the README file to reflect the change in fedsd usage

util/tracing/visualization/README.md

@@ -1,7 +1,9 @@
 # Trace sequence diagram visualizer
 
 `fedsd` is a utility that reports the interactions (exchanged messages)
-between federates and the RTI in a sequence-diagram-like format.
+between federates and the RTI in a sequence-diagram-like format. 
+It also reports the interactions between different encalves in an enclaved execution, where no RTI trace file is provided.
+
 
 To use `fedsd`, you need to first obtain an execution trace. To do this, enable the tracing mechanism in your Lingua Franca program by setting the `tracing` target property to `true` and then compile and run the program.
 
@@ -10,7 +12,7 @@ internally running `trace_to_csv`. It then aggregates the data from all `.csv`
 files to do the matching and draw the sequence diagram.
 
 # Installing
-`fedsd` is installed together with the rest of the tracing tools. For instructions refer to `~/util/tracing/README.md`.
+`fedsd` is installed together with the rest of the tracing tools. For instructions refer to `util/tracing/README.md`.
 
 
 # Running
@@ -20,20 +22,20 @@ file will be generated for each of the federates, in addition to `rti.lft`. The
 contains the RTI trace.
 
 If, however, the federation is launched manually, then running the `RTI` command should be passed the `-t` flag in order to make sure that it, too, has tracing enabled:
-```
-$ RTI -n <number_of_federates> -t
+```bash
+RTI -n <number_of_federates> -t
 ```
 
 It is most convenient to launch the RTI and all federates from the same working directory so that they will all write their trace file to that directory.
 
-Once the federation stopped executing, run `fedsd` on all generated `.lft` files:
-```
-$ fedsd *.lft
-```
-In case `trace_to_csv` executable is in a different location, other than `/usr/local/bin/`, then use the `INSTALL_PREFIX` flag, as follows:
+Once the federation stopped executing, running `fedsd` will operate on all the `.lft` files in the current directory:
+```bash
+fedsd
 ```
-fedsd INSTALL_PREFIX=~/.local/bin/ *.lft 
+It is also possible to operate on specific files. In such a case, run `fedsd` with `-r` flag to provide the RTI trace file, and `-f` flag to privide the list of federates
+trace files. Bith argumenets are optional.
+```bash
+fedsd -r <rti.lft> -f <federate__f1.lft> <federate--f2.lft>
 ```
 
-The output is an html file named `trace_svg.html` (in the current directory) that contains the sequence of interactions
-between the federates and the RTI.
+The output is an html file named `trace_svg.html` (in the current directory) that contains the sequence of interactions between the federates and the RTI.