Add info about drag / drop .txt file

[lpatiny]

Most of the tools allows to drag / drop a text file that is internally converted to JCAMP-DX file format but the text format is nowhere written.

Here are the rules to parse the text file:

• only the lines containing numbers are considered
• we split the lines based on comma, semi-column or tabulation
• we take the first and second column to create the JCAMP-DX file

@remisch Please could you add a 'tip' that can open everywhere we discuss about drag / drop a txt file ?

[lpatiny]

See some examples in
https://github.com/cheminfo/xy-parser/tree/404c9bc06d5b65882199424b01aeb8e771517bb7/testFiles

[lpatiny]

Example:

#"+ESI Scan (rt: 1.013-2.488 min, 446 scans) Frag=120.0V 13C-DNA-digested.d  Subtract "
#Point,X(Thompsons),Y(Counts)
0,100.0016,0.376953125
1,100.0045,0.772047996520996
2,100.0073,0.492866039276123
3,100.0102,0
4,100.0131,0
5,100.0159,0.287199020385742
6,100.0188,0.831634521484375
7,100.0217,1.11020517349243
8,100.0245,0.920641422271729