Add README.md

Author: antonmedv

cmd/exp/README.md

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+# exp
+
+## Install
+
+```bash
+go get github.com/antonmedv/expr/cmd/exp
+```
+
+## Usage
+
+Print ast of program.
+
+```bash
+echo '1 + 2' | exp -ast
+```
+
+Disassemble bytecode to human readable format.
+
+```bash
+echo 'map(0..9, {# * 2})' | exp -bytecode
+```
+
+Run expression.
+
+```bash
+echo '2**8' | exp -run
+```
+
+Start interactive debugger.
+
+```bash
+echo 'all(1..3, {# > 0})' | exp -debug
+```