Add schema for sample

src/main/resources/avro/bdg.avdl

@@ -1180,4 +1180,32 @@ record Feature {
  */
  map<string> attributes = {};
 }
+
+/**
+ Sample.
+*/
+record Sample {
+
+ /**
+ Identifier for this sample, e.g. IDENTIFIERS &rarr; PRIMARY_ID or other
+ subelements of IDENTIFERS in SRA metadata, sample tag SM in read group @RG header lines
+ in SAM/BAM files, or sample ID from the header or ##SAMPLE=&lt;ID=S_ID meta-information
+ lines in VCF files.
+ */
+ union { null, string } sampleId = null;
+
+ /**
+ Descriptive name for this sample, e.g. SAMPLE_NAME &rarr; TAXON_ID, COMMON_NAME,
+ INDIVIDUAL_NAME, or other subelements of SAMPLE_NAME in SRA metadata.
+ */
+ union { null, string } name = null;
+
+ /**
+ Map of attributes. Common attributes may include: SRA metadata not mentioned above,
+ e.g. SAMPLE &rarr; TITLE, SAMPLE &rarr; DESCRIPTION, and SAMPLE_ATTRIBUTES; ENA default
+ sample checklist attributes such as cell_type, dev_stage, and germline; and Genomes,
+ Mixture, and Description from sample meta-information lines in VCF files.
+ */
+ map<string> attributes = {};
 }
+}