add antlr source code and ReadMeHEADmain

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diff --git a/antlr4-cpp-runtime-4.9.2-source/runtime/src/atn/LexerPopModeAction.h b/antlr4-cpp-runtime-4.9.2-source/runtime/src/atn/LexerPopModeAction.h
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+++ b/antlr4-cpp-runtime-4.9.2-source/runtime/src/atn/LexerPopModeAction.h
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+/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
+ * Use of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
+#pragma once
+
+#include "atn/LexerAction.h"
+#include "atn/LexerActionType.h"
+
+namespace antlr4 {
+namespace atn {
+
+  /// <summary>
+  /// Implements the {@code popMode} lexer action by calling <seealso cref="Lexer#popMode"/>.
+  ///
+  /// <para>The {@code popMode} command does not have any parameters, so this action is
+  /// implemented as a singleton instance exposed by <seealso cref="#INSTANCE"/>.</para>
+  ///
+  /// @author Sam Harwell
+  /// @since 4.2
+  /// </summary>
+  class ANTLR4CPP_PUBLIC LexerPopModeAction final : public LexerAction {
+  public:
+    /// <summary>
+    /// Provides a singleton instance of this parameterless lexer action.
+    /// </summary>
+    static const Ref<LexerPopModeAction> getInstance();
+
+    /// <summary>
+    /// {@inheritDoc} </summary>
+    /// <returns> This method returns <seealso cref="LexerActionType#POP_MODE"/>. </returns>
+    virtual LexerActionType getActionType() const override;
+
+    /// <summary>
+    /// {@inheritDoc} </summary>
+    /// <returns> This method returns {@code false}. </returns>
+    virtual bool isPositionDependent() const override;
+
+    /// <summary>
+    /// {@inheritDoc}
+    ///
+    /// <para>This action is implemented by calling <seealso cref="Lexer#popMode"/>.</para>
+    /// </summary>
+    virtual void execute(Lexer *lexer) override;
+
+    virtual size_t hashCode() const override;
+    virtual bool operator == (const LexerAction &obj) const override;
+    virtual std::string toString() const override;
+
+  private:
+    /// Constructs the singleton instance of the lexer {@code popMode} command.
+    LexerPopModeAction();
+  };
+
+} // namespace atn
+} // namespace antlr4