Added README and icon

README.md

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+<h1 align="center">
+<img src="misc/lamb.svg" style="height:10ex"><br/>
+Lamb: A Lambda Calculus Engine
+</h1>
+
+
+## Todo (pre-release):
+ - Fix parser (call parentheses)
+ - Good command parsing (`:help`, `:save`, `:load`, `:macros` as a bare minimum)
+ - Python files: installable, package list, etc
+ - $\alpha$-equivalence check
+ - Don't expand macros until you absolutely have to
+ - Versioning
+ - Clean up runner & printing
+ - Count reductions
+
+## Todo:
+ - live syntax check
+ - Command and macro autocomplete
+ - step-by-step reduction
+ - Documentation in README
+ - Maybe a better icon?