(FEAT)[data]: Add FTIR spectrum data for stable and weathered polymers; include stable sample CSV

sample_data/ftir-stable-1.txt

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+# Sample FTIR spectrum data - Stable polymer
+# Wavenumber (cm^-1)  Absorbance
+400.0  0.045
+450.0  0.048
+500.0  0.052
+550.0  0.056
+600.0  0.061
+650.0  0.065
+700.0  0.070
+750.0  0.075
+800.0  0.082
+850.0  0.089
+900.0  0.096
+950.0  0.104
+1000.0  0.112
+1050.0  0.121
+1100.0  0.130
+1150.0  0.140
+1200.0  0.151
+1250.0  0.162
+1300.0  0.174
+1350.0  0.187
+1400.0  0.200
+1450.0  0.215
+1500.0  0.230
+1550.0  0.246
+1600.0  0.263
+1650.0  0.281
+1700.0  0.300
+1750.0  0.320
+1800.0  0.341
+1850.0  0.363
+1900.0  0.386
+1950.0  0.410
+2000.0  0.435
+2050.0  0.461
+2100.0  0.488
+2150.0  0.516
+2200.0  0.545
+2250.0  0.575
+2300.0  0.606
+2350.0  0.638
+2400.0  0.671
+2450.0  0.705
+2500.0  0.740
+2550.0  0.776
+2600.0  0.813
+2650.0  0.851
+2700.0  0.890
+2750.0  0.930
+2800.0  0.971
+2850.0  1.013
+2900.0  1.056
+2950.0  1.100
+3000.0  1.145
+3050.0  1.191
+3100.0  1.238
+3150.0  1.286
+3200.0  1.335
+3250.0  1.385
+3300.0  1.436
+3350.0  1.488
+3400.0  1.541
+3450.0  1.595
+3500.0  1.650
+3550.0  1.706
+3600.0  1.763
+3650.0  1.821
+3700.0  1.880
+3750.0  1.940
+3800.0  2.001
+3850.0  2.063
+3900.0  2.126
+3950.0  2.190
+4000.0  2.255

sample_data/ftir-weathered-1.txt

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+# Sample FTIR spectrum data - Weathered polymer
+# Wavenumber (cm^-1)  Absorbance
+400.0  0.062
+450.0  0.069
+500.0  0.077
+550.0  0.086
+600.0  0.095
+650.0  0.105
+700.0  0.116
+750.0  0.128
+800.0  0.141
+850.0  0.155
+900.0  0.170
+950.0  0.186
+1000.0  0.203
+1050.0  0.221
+1100.0  0.240
+1150.0  0.260
+1200.0  0.281
+1250.0  0.303
+1300.0  0.326
+1350.0  0.350
+1400.0  0.375
+1450.0  0.401
+1500.0  0.428
+1550.0  0.456
+1600.0  0.485
+1650.0  0.515
+1700.0  0.546
+1750.0  0.578
+1800.0  0.611
+1850.0  0.645
+1900.0  0.680
+1950.0  0.716
+2000.0  0.753
+2050.0  0.791
+2100.0  0.830
+2150.0  0.870
+2200.0  0.911
+2250.0  0.953
+2300.0  0.996
+2350.0  1.040
+2400.0  1.085
+2450.0  1.131
+2500.0  1.178
+2550.0  1.226
+2600.0  1.275
+2650.0  1.325
+2700.0  1.376
+2750.0  1.428
+2800.0  1.481
+2850.0  1.535
+2900.0  1.590
+2950.0  1.646
+3000.0  1.703
+3050.0  1.761
+3100.0  1.820
+3150.0  1.880
+3200.0  1.941
+3250.0  2.003
+3300.0  2.066
+3350.0  2.130
+3400.0  2.195
+3450.0  2.261
+3500.0  2.328
+3550.0  2.396
+3600.0  2.465
+3650.0  2.535
+3700.0  2.606
+3750.0  2.678
+3800.0  2.751
+3850.0  2.825
+3900.0  2.900
+3950.0  2.976
+4000.0  3.053

sample_data/stable.sample.csv

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+wavenumber,intensity
+200.0,1542.3
+205.0,1543.1
+210.0,1544.8
+215.0,1546.2
+220.0,1547.9
+225.0,1549.1
+230.0,1550.4
+235.0,1551.8
+240.0,1553.2
+245.0,1554.6
+250.0,1556.1
+255.0,1557.6
+260.0,1559.1
+265.0,1560.7
+270.0,1562.3
+275.0,1563.9
+280.0,1565.6
+285.0,1567.3
+290.0,1569.0
+295.0,1570.8
+300.0,1572.6