add sequence files

vfa_t1/README.md

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+## Intro
+
+The variable flip angle (VFA) implementation of [qMRLab](https://qmrlab.org) takes following as input:
+* Data
+     * `VFAData`: [vol X N] image data where N is # of FAs.
+     * `B1map`: [vol] b1 transmit field map
+     * `Mask`: [vol] binary ROI mask
+* Parameters
+    * `FA`: [1 X N] array
+    * `TR`: [1 X N] array
+
+For details you can see the interactive [`vfa_t1`](https://qmrlab.readthedocs.io/en/master/vfa_t1_batch.html) tutorial [executable online](https://qmrlab.org/jekyll/2018/12/11/T1-mapping-variable-flip-angle.html).
+
+For creating B1map, double angle method is also available in qMRLab: [`b1_dam`](https://qmrlab.readthedocs.io/en/master/b1_dam_batch.html).
+
+***
+
+## Pulse sequence implementation 
+
+### Sequence components 
+
+### Scan control 
+
+### Reconstruction 
+
+
+***
+
+
+
+
+