Provide more details for sucessfull running of unittests.

unittest/README.md

@@ -1,5 +1,82 @@
-Unit Testing for Tesseract
+# Unit Testing for Tesseract
-----------
+
+
+## Requirements
+
+### Files and structure
+```
+
+├── langdata_lstm
+│   ├── common.punc
+│   ├── common.unicharambigs
+│   ├── desired_bigrams.txt
+│   ├── eng
+│   │   ├── desired_characters
+│   │   ├── eng.config
+│   │   ├── eng.numbers
+│   │   ├── eng.punc
+│   │   ├── eng.singles_text
+│   │   ├── eng.training_text
+│   │   ├── eng.unicharambigs
+│   │   ├── eng.wordlist
+│   │   └── okfonts.txt
+│   ├── extended
+│   │   └── extended.config
+│   ├── extendedhin
+│   │   └── extendedhin.config
+│   ├── font_properties
+│   ├── forbidden_characters_default
+│   ├── hin
+│   │   ├── hin.config
+│   │   ├── hin.numbers
+│   │   ├── hin.punc
+│   │   └── hin.wordlist
+│   ├── kan
+│   │   └── kan.config
+│   ├── kor
+│   │   └── kor.config
+│   ├── osd
+│   │   └── osd.unicharset
+│   └── radical-stroke.txt
+├── tessdata
+│   ├── ara.traineddata
+│   ├── chi_tra.traineddata
+│   ├── eng.traineddata
+│   ├── heb.traineddata
+│   ├── hin.traineddata
+│   ├── jpn.traineddata
+│   ├── kmr.traineddata
+│   ├── osd.traineddata
+│   └── vie.traineddata
+├── tessdata_best
+│   ├── eng.traineddata
+│   ├── fra.traineddata
+│   ├── kmr.traineddata
+│   └── osd.traineddata
+├── tessdata_fast
+│   ├── eng.traineddata
+│   ├── kmr.traineddata
+│   ├── osd.traineddata
+│   └── script
+│       └── Latin.traineddata
+└── tesseract
+    ├── abseil
+    ...
+    ├── test
+    ├── unittest
+    └── VERSION
+```
+
+### Fonts
+
+* Microsoft fonts: arialbi.ttf, times.ttf, verdana.ttf - [instalation guide](https://www.makeuseof.com/tag/how-to-install-microsoft-core-fonts-in-ubuntu-linux/)
+* [ae_Arab.ttf](https://www.wfonts.com/download/data/2014/12/03/ae-arab/ae-arab.zip)
+* dejavu-fonts: [DejaVuSans-ExtraLight.ttf](https://dejavu-fonts.github.io/Download.html)
+* [Lohit-Hindi.ttf](https://raw.githubusercontent.com/pratul/packageofpractices/master/assets/fonts/Lohit-Hindi.ttf)
+* [UnBatang.ttf](https://raw.githubusercontent.com/byrongibson/fonts/master/backup/truetype.original/unfonts-core/UnBatang.ttf)
+
+
+## Run tests
 
 To run the tests, do the following in tesseract folder