Add early projects markdown file.

README.md

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+# Early CS 162 Projects
+My archives appear rather incomplete; I'm missing the source
+code for the small, introductory projects at the beginning
+of the class. For posterity, I will document them here.
+
+## Guessing Game
+The guessing game program must generate a random number
+between 1 and 100. It must then prompt the user to guess
+the number. If the guess is exactly right, the game
+ends. Otherwise, if the number is too low or too
+high, the game must tell the user so, and prompt
+them for another guess. The player keeps guessing
+until they get the right answer.
+
+Here's an example:
+
+```
+I'm thinking of a number between 1 and 100. What is it?
+> 50
+That's too low! Guess again.
+> 75
+That's too low! Guess again.
+> 87
+That's too low! Guess again.
+> 93
+That's too high! Guess again.
+> 92
+Correct!
+```
+
+## Palindrome
+The palindrome program must ask the user to enter
+a string of text. Any string of text should be supported,
+like `"hello"` `"my name is daniel"`, `"one, two, three!"`.
+Then, the program must print to the console whether
+or not the input string is a palindrome. A palindrome
+is a word or sentence that, when read backwards, is
+exactly the same thing. Here are some examples:
+
+```
+> hello
+This string is not a palindrome!
+> lol
+This string is a palindrome!
+> a man, a plan, a canal: panama!
+This string is a palindrome!
+```
+
+## Tic Tac Toe
+This is a simple game of Tic-Tac-Toe. We start with
+an empty 3x3 board, and two players can take turns placing
+their symbol (`X` or `O`) on the board. The game ends when
+a player makes a line out of their symbol (3 horizontal, 3 vertical,
+or 3 diagonal). The game also ends when there are no possible
+moves. Here's an example:
+
+```
+      A   B   C
+    .---.---.---.
+ 1  |   |   |   |
+    .---.---.---.
+ 2  |   |   |   |
+    .---.---.---.
+ 3  |   |   |   |
+    .---.---.---|
+
+Player 1> A1
+
+      A   B   C
+    .---.---.---.
+ 1  | X |   |   |
+    .---.---.---.
+ 2  |   |   |   |
+    .---.---.---.
+ 3  |   |   |   |
+    .---.---.---|
+
+Player 2> A3
+
+      A   B   C
+    .---.---.---.
+ 1  | X |   |   |
+    .---.---.---.
+ 2  |   |   |   |
+    .---.---.---.
+ 3  | O |   |   |
+    .---.---.---|
+
+Player 1> B2
+
+      A   B   C
+    .---.---.---.
+ 1  | X |   |   |
+    .---.---.---.
+ 2  |   | X |   |
+    .---.---.---.
+ 3  | O |   |   |
+    .---.---.---|
+
+Player 2> B3
+
+      A   B   C
+    .---.---.---.
+ 1  | X |   |   |
+    .---.---.---.
+ 2  |   | X |   |
+    .---.---.---.
+ 3  | O | O |   |
+    .---.---.---|
+
+Player 1> C3
+
+      A   B   C
+    .---.---.---.
+ 1  | X |   |   |
+    .---.---.---.
+ 2  |   | X |   |
+    .---.---.---.
+ 3  | O | O | X |
+    .---.---.---|
+
+Player 1 wins!
+```