adding example pages

docs/examples/plot-acceleration.md

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+## Plot Acceleration
+
+```blocks
+basic.forever(() => {
+    led.plotBarGraph(
+        input.acceleration(Dimension.X),
+        1023
+    )
+})
+```

docs/examples/plot-light-level.md

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+## Plot Light level
+
+```blocks
+basic.forever(() => {
+    led.plotBarGraph(
+        input.lightLevel(),
+        255
+    )
+})
+```