Add blurb RE: islandora_fits_tags migration...

... also, got lost in touching up formatting of things.

README.md

@@ -1,55 +1,59 @@
 # Islandora FITS
 Config module to make Islandora aware of FITS microservice
 
-
-
 ## Installation
 #### Install this module
 Install and enable this module in the usual way.  On installation the module will
-add a context causing the creation of A FITs media when an Original File media is ingested.
-
+add a context causing the creation of A FITS media when an Original File media is ingested; however, this process is
+predicated on the existence of an `islandora_media_use` term with an external URI of `https://projects.iq.harvard.
+edu/fits`--the `islandora_fits_tags` migration might be executed to create such a term.
 
 #### Install FITS Webservice
-FITS xmls are generated from an easily installed web service.  
+FITS XMLs are generated from an easily installed web service.
 Get the latest fits.zip and fits.war from https://projects.iq.harvard.edu/fits/downloads
 (on my box I had to install a missing zip library with
 ‘sudo apt-get install php7.1-zip’)
 
 Install following their instructions.
-Copy the .war file to your webapps directory  and test.
-Edit the catalina.properties file on the Drupal server by adding the 
-following two lines to the bottom of the file-
+Copy the `.war` file to your webapps directory and test.
+Edit the `catalina.properties` file on the Drupal server by adding the
+following two lines to the bottom of the file:
 
+```properties
 fits.home=/\<path-to-fits>/fits
-
 shared.loader=/\<path-to-fits>/fits/lib/*.jar
+```
 
-Restart Tomcat and test with 
-
-`curl -k -F datafile="@/path/to/myfile.jpg" http://example.com:8080/fits/examine`
+Restart Tomcat and test with:
+```bash
+curl -k -F datafile="@/path/to/myfile.jpg" http://example.com:8080/fits/examine
+```
 (note: the ‘@’ is required.)
 
 #### Installing Microservice
 Get code from https://github.com/roblib/CrayFits and install.  This code can live anywhere, including an external server,
-but most installations will have it at /var/www/html.
-
-The App runs by entering php bin/console server:start *:8050 in the App 
-root folder.
-The server is stopped with php bin/console server:stop.  
+but most installations will have it at `/var/www/html`.
+
+The App runs by entering:
+```bash
+php bin/console server:start *:8050
+```
+in the App root folder.
+The server is stopped with:
+```bash
+php bin/console server:stop
+```
 On a production machine you'd probably want to configure an additional
 port in Apache.
 
-
-Note: The location of the fits webserver is stored in the .env file in the 
-root dir of the Symfony app.  This will have to be reconfigured if the Fits 
-server is anywhere other than localhost:8080/fits
-
+Note: The location of the FITS webserver is stored in the `.env` file in the
+root dir of the Symfony app.  This will have to be reconfigured if the FITS
+server is anywhere other than `localhost:8080/fits`
 
 #### Adding FITs requests to the queue
 Copy the file `assets/ca.islandora.alpaca.connector.ocr.blueprint.xml`
 to `/opt/karak/deploy` on your server.  There is no need to restart.
 
-
 #### Adding Checksum to Display
 A pseudo field with the computed checksum can be added to Repository Item
 display.  Navigate to `admin/structure/types/manage/islandora_object/display`