add headers for data processing sections

content/03.methods.md

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+## Materials and Methods
+
+### Children's Brain Tumor Tissue Consortium Data
+
+### Pediatric Pacific Neuro-oncology Consortium Data
+
+### Germ Line Single Nucleotide Variant Calling
+
+### Germ Line Copy Number Variant Calling
+
+### Germ Line Structural Variant Calling
+
+### Somatic Single Nucleotide Variant Calling
+
+### Somatic Copy Number Variant Calling
+
+### Somatic Structural Variant Calling
+
+### Gene Expression Abundance Estimation
+
+### RNA Fusion Calling and Prioritization
+
+### Clinical Data Harmonization