Add chapters

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diff --git a/src/content/chapter0_basics/lesson06_number_formats/code.gleam b/src/content/chapter0_basics/lesson06_number_formats/code.gleam
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+++ b/src/content/chapter0_basics/lesson06_number_formats/code.gleam
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+import gleam/io
+
+pub fn main() {
+  // Underscores
+  io.debug(1_000_000)
+  io.debug(10_000.01)
+
+  // Binary, octal, and hex Int literals
+  io.debug(0b00001111)
+  io.debug(0o17)
+  io.debug(0xF)
+
+  // Scientific notation Float literals
+  io.debug(7.0e7)
+  io.debug(3.0e-4)
+}
diff --git a/src/content/chapter0_basics/lesson06_number_formats/text.html b/src/content/chapter0_basics/lesson06_number_formats/text.html
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+<p>
+  Underscores can be added to numbers for clarity. For example, 
+  <code>1000000</code> can be tricky to read quickly, while 
+  <code>1_000_000</code> can be easier.
+</p>
+<p>
+  Ints can be written in binary, octal, or hexadecimal formats using the
+  <code>0b</code>, <code>0o</code>, and <code>0x</code> prefixes respectively.
+</p>
+<p>
+  Floats can be written in a scientific notation.
+</p>
+