add cPCR assay

assays/cPCR/README.md

+<img src=protocols\SupplementaryFigure1.jpg width=60%>
+
+### Supplementary Figure 1 caption
+
+**Supplementary Figure 1.** Agarose gel electrophoresis of colony PCR products to prove the
+integration of the respective gene into the genome through heterologous recombination into the
+neutral site 2 (NS2). Number denote tested colonies, sizes of the expected PCR bands are shown.
+PCR was carried out with the colony PCR primers shown in Supplementary Table 2 (A) Dxs: 2232
+bp, IspD: 1002 bp, IspF: 795 bp (B) Tpi: 2041 bp, gapDH: 1323 bp, IspE: 1257 bp (C) IspG: 1521 bp
+(D) IspH: 1401 bp, CrtE M87F: 1089 bp (E) PyrK:2085 bp (F) Sqs: 1119 bp, Ipi: 1359 bp
+
+### Supplementary Figure 1 source
+
+https://www.frontiersin.org/articles/10.3389/fpls.2023.1024981/full#supplementary-material
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