update readme with querymodel examples

README.md

@@ -31,3 +31,115 @@ Additional Info: https://isa-specs.readthedocs.io/en/latest/isamodel.html
 
 # Usage
 
+## Querymodel
+
+The querymodel is used to intuitively retreive information from the ISA metadata. 
+
+```fsharp
+
+#r @"nuget: ISADotNet.XLSX"
+
+open ISADotNet
+
+
+let _,_,persons,a = ISADotNet.XLSX.AssayFile.Assay.fromFile assayPath
+
+let qa = QueryModel.QAssay.fromAssay a
+
+```
+
+### Retreiving values:
+
+```fsharp
+let firstValue = qa.Values().First
+
+firstValue.NameText
+firstValue.ValueText
+```
+-> 
+```
+val it: string = "Sample type"
+
+val it: string = "cell culture"
+```
+
+### Retreiving nodes:
+
+```fsharp
+qa.Sources().Head
+qa.FirstSamples().Head
+qa.FirstData().Head
+qa.LastData().Head
+```
+-> 
+```
+
+val it: string = "001_uncult_8°"
+
+val it: string = "001-007_uncult_8°_son"
+
+val it: string = "20210913_1558_001.mzml"
+
+val it: string = "20210913_1558_001.mzml"
+```
+
+### Nodes as anchors:
+
+```fsharp
+let nodeOfInterest = qa.Samples().[5]
+
+qa.FirstProcessedDataOf(nodeOfInterest)
+```
+->
+```
+val nodeOfInterest: string = "008-014_uncult_22°_ext"
+
+val it: string list =
+  ["20210913_1558_021.mzml"; "20210913_1558_022.mzml";
+   "20210913_1558_023.mzml"; "20210913_1558_024.mzml";
+   "20210913_1558_025.mzml"; "20210913_1558_026.mzml";
+   "20210913_1558_027.mzml"; "20210913_1558_028.mzml";
+   "20210913_1558_029.mzml"; "20210913_1558_030.mzml";
+   "20210913_1558_031.mzml"; "20210913_1558_032.mzml";
+   "20210913_1558_033.mzml"; "20210913_1558_034.mzml";
+   "20210913_1558_035.mzml"; "20210913_1558_036.mzml";
+   "20210913_1558_037.mzml"; "20210913_1558_038.mzml";
+   "20210913_1558_039.mzml"; "20210913_1558_040.mzml"]
+```
+----
+```fsharp
+qa.SourcesOf(nodeOfInterest)
+```
+->
+```
+val it: string list =
+  ["008_uncult_22°"; "009_uncult_22°"; "010_uncult_22°"; "011_uncult_22°";
+   "012_uncult_22°"; "013_uncult_22°"; "014_uncult_22°"]
+```
+----
+```fsharp
+qa.PreviousCharacteristicsOf(nodeOfInterest)
+    .Item("Organism")
+    .ValueText
+```
+->
+```
+val it: string = "Chlamydomonas rheinhardtii"
+```
+----
+```fsharp
+qa.SucceedingParametersOf(nodeOfInterest)
+|> Seq.map (fun p -> p.HeaderText,p.ValueText)
+|> Seq.take 5
+|> Seq.toList
+```
+->
+```
+val it: (string * string) list =
+  [("Parameter [Library strategy]", "Illumina library prep");
+   ("Parameter [Library Selection]", "cDNA");
+   ("Parameter [Library layout]", "single-end");
+   ("Parameter [Library preparation kit]",
+    "CleanTag® Small RNA Library Prep Kit");
+   ("Parameter [Library preparation kit version]", "3")]
+```