Add installation and file documentation to README

README.md

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 B!SON helps you to find a suitable Open Access journal for your publication by leveraging semantic and bibliometric methods. Simply enter the details of your manuscript below or fetch the details of a paper via its DOI or arXiv ID. It is not necessary to provide all fields.
 The journal information is provided by the Directory of Open Access Journals (DOAJ). We cannot guarantee the correctness and details (like costs) should be checked on the journal homepage before submitting.
+
+## Installation
+
+The basic knowledge about TYPO3 11.x and Composer is necessary for the installation.
+
+### Composer Commands
+
+```
+composer config repositories.slub-web-bison git https://git.slub-dresden.de/typo3/sitepackages/slub-web-bison.git
+composer require slub/slub-web-bison
+```
+
+## Files
+
+Allowed file types:
+- CSV
+- XLSX
+
+### Index Databases
+
+CSV containig list of journals with information in which index databases they are available.
+
+#### Columns
+
+1. **P-ISSN** - possible values: ISSN numbers in format *xxxx-xxxx* or empty
+2. **E-ISSN** - possible values: ISSN numbers in format *xxxx-xxxx*
+3. **PubMed** - possible values: *Y* or *N*
+4. **OpenAlex** - possible values: *Y* or *N*
+5. **Web of Science** - possible values: *Y* or *N*
+6. **Scopus** - possible values: *Y* or *N*
+
+#### Example
+| P-ISSN | E-ISSN | PubMed | OpenAlex | Web of Science | Scopus |
+| -------- | -------- | -------- | -------- | -------- | -------- |
+|  | 2473-6988 | Y | Y | N | N |
+| 0886-7356 | 1548-1360 | Y | Y | N | N |
+
+
+### Local Prices
+
+CSV containig list of journals with local prices.
+
+#### Columns
+
+1. **P-ISSN** - possible values: ISSN numbers in format *xxxx-xxxx* or empty
+2. **E-ISSN** - possible values: ISSN numbers in format *xxxx-xxxx*
+3. **Betrag** - possible values: price in format *xxx* or *xxx,xx*
+4. **Währung** - possible values: currency code e.g *USD* or *EUR*
+5. **Finanzierung** - possible values: *Vollfinanzierung* (something else?)
+6. **Source** - possible values: *URL*
+
+#### Example
+| P-ISSN | E-ISSN | Betrag | Währung | Finanzierung | Source |
+| -------- | -------- | -------- | -------- | -------- | -------- |
+|  | 2473-6988 | 1200 | USD | Vollfinanzierung | URL |
+| 0886-7356 | 1548-1360 | 0 | EUR | Vollfinanzierung | URL |
+
+
+### Mirror Journals
+
+CSV containig list of mirror journals.
+
+#### Columns
+
+1. **Publisher** - possible values: name of publisher
+2. **Journal title** - possible values: title of mirror journal
+3. **ISSN Mirror Journal (OA)** - possible values: ISSN numbers in format *xxxx-xxxx*
+4. **Journal URL** - possible values: *URL*
+5. **Check URL in DOAJ** - possible values: *URL*
+6. **Original Journal (Subscription)** - possible values: title of original journal
+7. **Original Journal is hybrid** - possible values: *ja* or *nein*
+8. **ISSN Original Journal (closed)** - ISSN numbers in format *xxxx-xxxx*
+9. **Mirror Journal [ja/nein]** - possible values: *ja* or *nein*
+10. **Title discontinued** - possible values: year in format *xxxx* or empty
+11. **letze Prüfüng am** - possible value: date in format *xx.xx.xxxx*
+
+#### Example
+| Publisher | Journal title | ISSN Mirror Journal (OA) | Journal URL | Check URL in DOAJ | Original Journal (Subscription) | Original Journal is hybrid | ISSN Original Journal (closed) | Mirror Journal [ja/nein] | Title dis. | letze Prüfüng am |
+| -------- | -------- | -------- | -------- | -------- | -------- | -------- | -------- | -------- | -------- | -------- |
+| Elsevier | Title | 2590-1613 | https://xyz.ab | https://doaj.org/ | Title | ja | 0301-2115 | Ja (discontinued) | 2022 | 25.07.2022 |
+| Elsevier | Title | 2590-1614 | https://xyz.ab | https://doaj.org/ | Title | ja | 0301-2116 | Ja |  | 25.07.2022 |